a primitive root; to separate mentally (or distinguish), i.e.(generally) understand:--attend, consider, be cunning, diligently, direct, discern, eloquent, feel, inform, instruct, have intelligence, know, look well to, mark, perceive, be prudent, regard, (can) skill(-full), teach, think, (cause, make to, get, give, have) understand(-ing), view, (deal) wise(-ly, man).