Insert to term record Increase to term record B1 [ C or U ] a way of behaving or even a belief that has been set up for a very long time:Middle English custume from Aged French costume from Latin cōnsuētūdō cōnsuētūdin- from cōnsuētus previous participle of cōnsuēscere to accustom com- intensive pref.He ordered concurrently that each one