catch sight of; to perceive with the eyes

capable of being seen or noticed

quick to notice; showing quick and keen perception

the act of making and recording a measurement

the act of noticing or paying attention

facts learned by observing

trap; especially in an error or in a reprehensible act

detect some circumstance or entity automatically

find an instance of (a word or particular usage of a word)

discover traces of

observe as if with an eye

make a discovery, make a new finding