1. (n.) The act or the faculty of observing or taking notice; the act of seeing, or of fixing the mind upon, anything.

2. (n.) The result of an act, or of acts, of observing; view; reflection; conclusion; judgment.

3. (n.) Hence: An expression of an opinion or judgment upon what one has observed; a remark.

4. (n.) Performance of what is prescribed; adherence in practice; observance.

5. (n.) The act of recognizing and noting some fact or occurrence in nature, as an aurora, a corona, or the structure of an animal.

6. (n.) 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.

7. (n.) The information so acquired.

Parthian shot accordance acquittal acquittance address adherence advertence advertency affirmation alertness allegation announcement answer apostrophe apprehension assertion assiduity assiduousness assumption attention attention span attentiveness attitude averment awareness bugging care carrying out climate of opinion cloak-and-dagger work cognizance comment commentary common belief community sentiment compliance conceit concentration concept conception conclusion conformance conformity consciousness consensus gentium consideration counterespionage counterintelligence crack criticism declaration dictum diligence discharge discovery ear earnestness electronic surveillance espial espionage estimate estimation ethos examination exclamation execution expression eye fancy feeling following fulfillment general belief greeting heed heedfulness heeding idea image imago impression inspection intellectual object intelligence intelligence work intentiveness intentness interjection judgment keeping lights looking lookout mark memory-trace mental image mental impression mention military intelligence mind mindfulness mystique note notice notion obiter dictum observance opinion perception performance personal judgment phrase point of view popular belief position posture practice presumption prevailing belief proclamation pronouncement public belief public opinion question reaction recept reflection regard regardfulness remark representation respect satisfaction say saying scrutiny secret police secret service sentence sentiment shadowing sight spying stakeout stance statement subjoinder supposition surveillance survey tailing theory thinking thought trailing utterance view viewing watch watching way of thinking wiretap wiretapping witnessing word