See detect in Webster's New World Roget's A-Z Thesaurus II
verb
To perceive, especially barely or fleetingly:
catch, descry, discern, espy, glimpse, spot, spy. See seeTo perceive with a special effort of the senses or the mind:
descry, discern, distinguish, mark, mind, note, notice, observe, remark, see. See knowledge, see
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