WordNet sense 1 (determine the essential quality of):

define, delimit, delineate, delimitate

WordNet sense 2 (be specific about):

particularize, specialize, particularise, specialise

WordNet sense 3 (specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement):

condition, qualify, stipulate, stipulate

WordNet sense 4 (decide upon or fix definitely):

determine, fix, limit, set

WordNet sense 5 (define clearly):

narrow, nail down, pin down, narrow down, peg down

WordNet sense 6 (design or destine):

designate, destine, intend

WordNet sense 7 (select something or someone for a specific purpose):

assign