KEY: Observation.
SYN: Contemplation, study, remark, attention, notice, comment.
ANT: Disregard, oversight, inadvertence, inattention, silence, ignorance.
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KEY: Observe.
SYN: Remark, mark, watch, note, behold, perceive keep, heed, respect, [See PERCEIVE].
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KEY: Obsolete.
SYN: Antiquated, past, effete, disused, archaic, old-fashioned.
ANT: Fashionable, modern, current, customary, operative, extant.