Origin of usual
Word Origin for usual
late 14c., from Old French usuel (late 13c.), from Late Latin usualis "ordinary," from Latin usus "custom" (see use). The usual suspects is from a line delivered by Claude Rains (as a French police inspector) in "Casablanca" (1942).
In the normal, habitual, or accustomed way, as in As usual, he forgot to put away the milk. This idiom was first recorded in 1716. Also see business as usual.
see as usual; business as usual.