必定 Traditional form: 必定 Pinyin (reading): bìdìng Definitions: to be bound to to be sure to Characters: 必 - surely, certainly; must; will 定 - to decide, to fix, to settle; to order; definite, fixed, sure Traditional characters: 必 - surely, certainly; must; will 定 - to decide, to fix, to settle; to order; definite, fixed, sure