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{adj: acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp} having or demonstrating ability to recognize or draw fine distinctions
"an acute observer of politics and politicians"
"incisive comments"
"icy knifelike reasoning"
"as sharp and incisive as the stroke of a fang"
"penetrating insight"
"frequent penetrative observations"

{adj: ascertained, discovered, observed} discovered or determined by scientific observation
"variation in the ascertained flux depends on a number of factors"
"the discovered behavior norms"
"discovered differences in achievement"
"no explanation for the observed phenomena"

{adj: clinical} relating to a clinic or conducted in or as if in a clinic and depending on direct observation of patients
"clinical observation"
"clinical case study"

{adj: confirmable, verifiable, falsifiable} capable of being tested (verified or falsified) by experiment or observation

{adj: empirical, empiric} derived from experiment and observation rather than theory
"an empirical basis for an ethical theory"
"empirical laws"
"empirical data"
"an empirical treatment of a disease about which little is known"
<-> theoretical

{adj: experienced, experient} having experience; having knowledge or skill from observation or participation
<-> inexperienced

{adj: experimental, data-based, observational} relying on observation or experiment
"experimental results that supported the hypothesis"

{adj: hardheaded, hard-nosed, practical, pragmatic} guided by practical experience and observation rather than theory
"a hardheaded appraisal of our position"
"a hard-nosed labor leader"
"completely practical in his approach to business"
"not ideology but pragmatic politics"

{adj: imprecise} not precise
"imprecise astronomical observations"
"the terms he used were imprecise and emotional"
<-> precise

{adj: intuitive, nonrational, visceral} obtained through intuition rather than from reasoning or observation

{adj: passionless} not passionate
"passionless observation of human nature"
<-> passionate

{adj: perceptive} having the ability to perceive or understand; keen in discernment
"a perceptive eye"
"a perceptive observation"
<-> unperceptive

{adj: present} temporal sense; intermediate between past and future; now existing or happening or in consideration
"the present leader"
"articles for present use"
"the present topic"
"the present system"
"present observations"
<-> future, past

{adj: semiempirical} relying to some extent on observation or experiment

{adj: supervised} under observation or under the direction of a superintendent or overseer
"supervised play"
<-> unsupervised

{adj: synthetic, synthetical} of a proposition whose truth value is determined by observation or facts
"`all men are arrogant' is a synthetic proposition"
<-> analytic

{adj: unobservable} not accessible to direct observation

{adj: unsupervised} not supervised or under constant observation
"the school maintains unsupervised study halls during free periods"
"reliable workers are generally unsupervised"
<-> supervised

{adv: empirically, through empirical observation, by trial and error} in an empirical manner
"this can be empirically tested"
<-> theoretically

{n: Brahe, Tycho Brahe} Danish astronomer whose observations of the planets provided the basis for Kepler's laws of planetary motion (1546-1601)

{n: Compton, Arthur Compton, Arthur Holly Compton} United States physicist noted for research on x-rays and gamma rays and nuclear energy; his observation that X-rays behave like miniature bowling balls in their interactions with electrons provided evidence for the quantal nature of light (1892-1962)

{n: Paracelsus, Philippus Aureolus Paracelsus, Theophrastus Philippus Aureolus Bombastus von Hohenheim} Swiss physician who introduced treatments of particular illnesses based on his observation and experience; he saw illness as having an external cause (rather than an imbalance of humors) and replaced traditional remedies with chemical remedies (1493-1541)

{n: Parkinson's law} C. Northcote Parkinson's cynical observation that the number of subordinates in an organization will increase linearly regardless of the amount of work to be done

{n: Parkinson's law} C. Northcote Parkinson's cynical observation that work will expand so as to fill the time available for its completion

{n: agreement, correspondence} compatibility of observations
"there was no agreement between theory and measurement"
"the results of two tests were in correspondence"

{n: air reconnaissance} reconnaissance either by visual observation from the air or through the use of airborne sensors

{n: art, artistry, prowess} a superior skill that you can learn by study and practice and observation
"the art of conversation"
"it's quite an art"

{n: astrodome} a transparent dome on top of an airplane where the navigator can make celestial observations

{n: biometrics, biometry, biostatistics} a branch of biology that studies biological phenomena and observations by means of statistical analysis

{n: blimp, sausage balloon, sausage} a small nonrigid airship used for observation or as a barrage balloon

{n: cardiac monitor, heart monitor} a piece of electronic equipment for continual observation of the function of the heart

{n: clutter} unwanted echoes that interfere with the observation of signals on a radar screen

{n: constancy, perceptual constancy} (psychology) the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation

{n: contemplation} a long and thoughtful observation

{n: control tower} a tower with an elevated workspace enclosed in glass for the visual observation of aircraft around an airport

{n: dead reckoning} navigation without the aid of celestial observations

{n: diary, journal} a daily written record of (usually personal) experiences and observations

{n: experience} the content of direct observation or participation in an event
"he had a religious experience"
"he recalled the experience vividly"

{n: experimental method} the use of controlled observations and measurements to test hypotheses

{n: extrapolation} an inference about the future (or about some hypothetical situation) based on known facts and observations

{n: fetoscopy, foetoscopy} prenatal diagnosis that allows direct observation of a fetus in the uterus and the withdrawal of fetal blood

{n: fluoroscope, roentgenoscope} an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation

{n: frequency, absolute frequency} the number of observations in a given statistical category

{n: frequency, relative frequency} the ratio of the number of observations in a statistical category to the total number of observations

{n: hypothesis} a proposal intended to explain certain facts or observations

{n: inference, illation} the reasoning involved in drawing a conclusion or making a logical judgment on the basis of circumstantial evidence and prior conclusions rather than on the basis of direct observation

{n: lookout, observation post} an elevated post affording a wide view

{n: lookout, observation tower, lookout station, observatory} a structure commanding a wide view of its surroundings

{n: loophole} a small hole in a fortified wall; for observation or discharging weapons

{n: material} information (data or ideas or observations) that can be used or reworked into a finished form
"the archives provided rich material for a definitive biography"

{n: meteorological observation post, weather station} one of a networks of observation posts where meteorological data is recorded

{n: nonparametric statistic, distribution free statistic} a statistic computed without knowledge of the form or the parameters of the distribution from which observations are drawn

{n: notice, observation, observance} the act of noticing or paying attention
"he escaped the notice of the police"

{n: observation dome} lookout consisting of a dome-shaped observatory

{n: observation station} a station set up for making observations of something

{n: observation, observance, watching} the act of observing; taking a patient look

{n: observation, reflection, reflexion} a remark expressing careful consideration

{n: observation} facts learned by observing
"he reported his observations to the mayor"

{n: observation} the act of making and recording a measurement

{n: observed fire} fire for which the point of impact (the burst) can be seen by an observer; fire can be adjusted on the basis of the observations

{n: optical bench} apparatus for observation and measurement of optical phenomena

{n: paper} a scholarly article describing the results of observations or stating hypotheses
"he has written many scientific papers"

{n: projection} a prediction made by extrapolating from past observations

{n: quackery, empiricism} medical practice and advice based on observation and experience in ignorance of scientific findings

{n: radio observation} an observation made with a radio telescope

{n: randomization, randomisation} a deliberately haphazard arrangement of observations so as to simulate chance

{n: sampling station, sampler} an observation station that is set up to make sample observations of something

{n: scientific fact} an observation that has been confirmed repeatedly and is accepted as true (although its truth is never final)

{n: scientific method} a method of investigation involving observation and theory to test scientific hypotheses

{n: scientific theory} a theory that explains scientific observations
"scientific theories must be falsifiable"

{n: shadow} refuge from danger or observation
"he felt secure in his father's shadow"

{n: sketch map} a map drawn from observation (rather than from exact measurements) and representing the main features of an area

{n: solar telescope} a telescope designed to make observations of the sun

{n: space probe} a rocket-propelled guided missile that can escape the earth's atmosphere; makes observations of the solar system that cannot be made by terrestrial observation

{n: stargazing} observation of the stars

{n: surveillance system} a closed-circuit television system used to maintain close observation of a person or group

{n: surveillance} close observation of a person or group (usually by the police)

{n: testing ground, laboratory} a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation
"the new nation is a testing ground for socioeconomic theories"
"Pakistan is a laboratory for studying the use of American troops to combat terrorism"

{n: watchtower} an observation tower for a lookout to watch over prisoners or watch for fires or enemies

{n: weather ship} an oceangoing vessel equipped to make meteorological observations

{v: commemorate, mark} mark by some ceremony or observation
"We marked the anniversary of his death"

{v: establish, base, ground, found} use as a basis for ; found on
"base a claim on some observation"

{v: relate, interrelate} be in a relationship with
"How are these two observations related?"

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