usage: detect with the senses; "The fleeing convicts were picked out of the darkness by the watchful prison guards"; "I can't make out the faces in this photograph"
4. greet, recognize, recognise, address, accost, come up to
usage: express greetings upon meeting someone
5. acknowledge, recognize, recognise, thank, give thanks
usage: express obligation, thanks, or gratitude for; "We must acknowledge the kindness she showed towards us"
usage: accept (someone) to be what is claimed or accept his power and authority; "The Crown Prince was acknowledged as the true heir to the throne"; "We do not recognize your gods"