Quiz: Remember the definition of mal de mer?
c.1200, "to watch with hostile intent, lie in wait for," from Old North French waitier "to watch" (Old French gaitier, Modern French guetter), from Frankish *wahton (cf. Dutch wacht "a watching," Old High German wahten, German wachten "to watch, to guard;" Old High German wahhon "to watch, be awake," Old English wacian "to be awake;" see wake (v.)). General sense of "remain in some place" is from late 14c.; that of "to see to it that something occurs" is late 14c. Meaning "to stand by in attendance on" is late 14c.; specific sense of "serve as an attendant at a table" is from 1560s. Related: Waited; waiting.
To wait (something) out "endure a period of waiting" is recorded from 1909, originally American English, in reference to baseball batters trying to draw a base on balls. Waiting game is recorded from 1890. Waiting room is attested from 1680s. Waiting list is recorded from 1897; the verb wait-list "to put (someone) on a waiting list" is recorded from 1960.
early 13c., "a watcher, onlooker," from Old North French wait, Old French gaite, from gaitier (see wait (v.)). From late 14c. as "an ambush, a trap" (as in lie in wait).
an English town watchman or public musician who sounded the hours of the night. In the later Middle Ages the waits were night watchmen, who sounded horns or even played tunes to mark the hours. In the 15th and 16th centuries waits developed into bands of itinerant musicians who paraded the streets at night at Christmas time. From the early 16th century, London and all the chief boroughs had their corporation waits.