Noun
The act or the faculty of observing or taking notice; the act of seeing, or of fixing the mind upon, anything.
The result of an act, or of acts, of observing; view; reflection; conclusion; judgment.
Hence: An expression of an opinion or judgment upon what one has observed; a remark.
Performance of what is prescribed; adherence in practice; observance.
The act of recognizing and noting some fact or occurrence in nature, as an aurora, a corona, or the structure of an animal.
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.
The information so acquired.
Source: Webster's dictionaryNothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life. Marcus Aurelius
Anarchism is founded on the observation that since few men are wise enough to rule themselves, even fewer are wise enough to rule others. Edward Abbey
Strategy requires thought, tactics require observation. Max Euwe
There is a fundamental difference between religion, which is based on authority and science, which is based on observation and reason. Science will win, because it works. Stephen Hawking
Be as familiar with observation as you are with the place you live. Maasai Proverb
When an observation by joke is true, it is out of place and ill-natured. Latin Proverb