Definition of "as usual"

as usual

adverb
not comparable
1. As is usually the case; as always.
  Quotations
  “A tight little craft,” was Austin’s invariable comment on the matron; […]. ¶ Near her wandered her husband, orientally bland, invariably affable, and from time to time squinting sideways, as usual, in the ever-renewed expectation that he might catch a glimpse of his stiff, retroussé moustache.
  1907 August, Robert W[illiam] Chambers, chapter IX, in The Younger Set, New York, N.Y.: D. Appleton & Company
  […] and, the 3n by 3n matrix M is, as usual, diagonal with the masses occurring down the main diagonal in sets of three […].
  2008, Firdaus E. Udwadia, Robert E. Kalaba, Analytical Dynamics: A New Approach, Cambridge University Press, page 83