Is it ensure, insure, or assure?
early 15c., of stitching, from Old French cuilte contrepointe "quilt stitched through and through," altered from coute pointe, from Medieval Latin culcita puncta "quilted mattress," from Latin culcita "cushion" + puncta, fem. past participle of pungere "to prick, stab" (see pungent).
Of music, mid-15c., from Old French contrepoint, from Medieval Latin cantus contrapunctus, from contrapunctum, from Latin contra + puncta, with reference to the indication of musical notes by "pricking" with a pointed pen over or under the original melody on a manuscript.
1530s, "contraction of a word by omission of middle sounds," from Medieval Latin syncopationem (nominative syncopatio) "a shortening or contraction," from syncopare "to shorten," also "to faint away, to swoon," from Late Latin syncope (see syncope). Musical sense is attested from 1590s.
in music, the displacement of regular accents associated with given metrical patterns, resulting in a disruption of the listener's expectations and the arousal of a desire for the reestablishment of metric normality; hence the characteristic "forward drive" of highly syncopated music. Syncopation may be effected by accenting normally weak beats in a measure, by resting on a normal accented beat, or by tying over a note to the next measure