1 fixed and unlikely to change; certain 明确的;肯定的:
I'll give you a definite decision in a couple of days.我会在几天内给你一个明确的决定。 [OPP] indefinite 反义词为indefinite
2 clear; easy to see or notice 清楚的;明显的:
There has been a definite change in her attitude recently.最近她的态度已经有明显的改变。