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Definition of observation : 1. Hence: An expression of an opinion or judgment upon what one has observed; a remark.
2. Performance of what is prescribed; adherence in practice; observance.
3. Specifically, the act of measuring, with suitable instruments, some magnitude, as the time of an occultation, with a clock; the right ascension of a star, with a transit instrument and clock; the sun's altitude, or the distance of the moon from a star, with a sextant; the temperature, with a thermometer, etc.
4. The act of recognizing and noting some fact or occurrence in nature, as an aurora, a corona, or the structure of an animal.
5. The act or the faculty of observing or taking notice; the act of seeing, or of fixing the mind upon, anything.
6. The information so acquired.
7. The result of an act, or of acts, of observing; view; reflection; conclusion; judgment.

Synonyms:

comment, reflexion, contemplation, bill, detection, indifference, annotation, thoughtfulness, poster, estimation, knowledge, investigation, ceremony, rumination, note, research, obstruction, cognizance, observance, see, espial, pronouncement, notification, noticing, remark, mark, overlook, acumen, heed, ascertainment, placard, ceremonial, mirror image, probe, regard, words, view, obiter dictum, expression, ceremonial occasion, musing, honoring, card, watch, awareness, check, utterance, posting, reflectivity, measurement

consideration, interest, heedfulness, engrossment, absorption, immersion, entrancement, diligence, caution, care, regardfulness, notice, intentness, watchfulness, attention, concentration, enrapture, concern, mindfulness, scrutiny, rapture, attentiveness, alertness, fascination

image, opinion, concept, reflection, supposition, perception, ideation, notion, thought, conception, inkling, plan, theory, idea, principle, vision, design, brainstorm, inspiration

outlook, sight, discernment, witnessing, seeing, inspection, eyesight, watching, regarding, viewpoint

deposition, certification, confirmation, attestation, connotation, evidence, declaration, information, data, demonstration, indication, documentation, fact, exemplification, manifestation, corroboration, testimony, illustration, support, proof, establishment, substantiation, exhibit, statement, counter-evidence, specimen, determination, authentication, validation, quotation

Usage examples:

• Don Luis drew a step nearer, as if not understanding her last observation. - "The Prime Minister", W.H.G. Kingston.
• We of Leaplow are, in effect, the only people who have had much to do with it, and I am now telling you what is the result of my own observation, in my own country. - "The Monikins", J. Fenimore Cooper.
• I hope we may soon have a more detailed account of his particular observation bearing on this interesting subject. - "The History of the European Fauna", R. F. Scharff.