I. -ch(ə)nə̇st noun
( -s )
: one who favors expansionism:
a. : an advocate of an enlarged paper currency
b. : an advocate of territorial expansion
II. adjective
: practicing, advocating, or tending toward expansion ; specifically : pressing for a policy of extending a nation's political and economic dominance
we must make it perfectly clear that we are not ourselves expansionist — H.L.Stimson