Add to term list Add to term listing B1 [ C or U ] a way of behaving or a perception that's been set up for some time:Center English custume from Aged French costume from Latin cōnsuētūdō cōnsuētūdin- from cōnsuētus earlier participle of cōnsuēscere to accustom com- intense pref.It emerges in the effects of novel conditions on historical