"purpose," early 13c., from Old French entent, entente "goal, end, aim, purpose; attention, application," and directly from Latin intentus "a stretching out," in Late Latin "intention, purpose," noun use of past participle of intendere "stretch out, lean toward, strain," literally "to stretch out" (see intend). In law, "state of mind with respect to intelligent volition" (17c.).
late 14c., "very attentive, eager," from Latin intentus "attentive, eager, waiting, strained," past participle of intendere "to strain, stretch" (see intend). Sense of "having the mind fixed (upon something)" is from c. 1600. Related: Intently.