the world > action or operation > behaviour > customary or habitual mode of behaviour > in habitual or customary use [phrase] > as a habit or custom > usually or customarily
of customc1300
by usage?c1425
?c1425 (c1380) G. ChaucerFormer Age (Cambr. Ii.3.21) (1878) l. 4 The fructes..Whiche þat the feldes yaue hem by vsage.