01 a. Taking notice; viewing or noticing attentively; watchful; carefully attentive; as, an observant spectator; observant habits.
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1.
Taking notice; viewing or noticing attentively; watchful; carefully attentive; as, an observant spectator; observant habits.“Wandering from clime to clime observant stray'd.” — Pope.
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2.
Submissively attentive; obediently watchful; regardful; mindful; obedient (to); -- with of, as, to be observant of rules.“We are told how observant Alexander was of his master Aristotle.” — Sir K. Digby.