经常性
惯常

[ noun ]
commonness by virtue of not being unusual
<noun.attribute>

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.

Consultation with oracles was a thing very usual and
frequent in their times. --Hooker.

We can make friends of these usual enemies. --Baxter.
※ -- {U"su*al*ly}, adv. -- {U"su*al*ness}, n.