"a harbor on the sea; a city or town on such a harbor," 1590s, from sea + port (n.1).

"to rest or place on or as on a pillow," 1620s, from pillow (n.). Related: Pillowed; pillowing.

1630s, from Japanese kimono, literally "a thing put on," from ki "wear, put on" + mono "thing."

"on the contrary, on the other hand," mid-15c.; see contrary + wise (n.).

also on-line, in reference to computers, "directly connected to a peripheral device," 1950; see on + line (n.).

"one whose profession is advising on matters of food and nutrition and their effect on health," 1926, from nutrition + -ist.

c. 1400, "to put a border on;" 1530s as "to lie on the border of," from border (n.). Related: Bordered; bordering.

"on which," c. 1200, from where (in the sense of "in which position or circumstances") + on (adv.).

"on fire," c. 1200, afure, from a- (1) "on" + fire (n.). Figurative use by late 14c.

"situated on (the speaker's) side of the mountain or mountains," 1826, from Latin cis- "on this side of" (see cis-) + stem of mons "mountain" (from PIE root *men- (2) "to project"). Specifically "on the north side of the Alps" (compare ultramontane).