From WordNet (r) 2.0 (August 2003) [wn]:
usually
adv : under normal conditions; "usually she was late" [syn:
normally, unremarkably, commonly, ordinarily]
[ant: unusually]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Usual \U"su*al\, a. [L. usualis, from usus use: cf. F. usuel.
See Use, n.]
Such as is in common use; such as occurs in ordinary
practice, or in the ordinary course of events; customary;
ordinary; habitual; common.
[1913 Webster]
Consultation with oracles was a thing very usual and
frequent in their times. --Hooker.
[1913 Webster]
We can make friends of these usual enemies. --Baxter.
[1913 Webster] -- U"su*al*ly, adv. -- U"su*al*ness, n.
[1913 Webster]