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to confirm or make something definite
我确定明天会下雨。
I'm certain it will rain tomorrow.
你确定这个答案是对的吗？
Are you sure this answer is correct?
Used to express certainty or to validate a decision/action.
definite or certain
这是确定的计划。
This is a definite plan.
Functions as an adjective meaning 'fixed' or 'established'.
确定 emphasizes the act of making something definite or certain, while 确认 focuses on verifying existing information. Example: '确定计划' (finalize the plan) vs. '确认计划' (verify the plan).
确定 as a verb almost always takes a noun object (e.g., 确定时间, 确定答案). It cannot stand alone without context.
Composed of 确 (què, 'sure/firm') + 定 (dìng, 'fixed/decided'), reflecting the idea of 'making something firm or certain'. The compound has been used in Classical Chinese with similar meanings.
1) Often used in formal contexts (e.g., contracts, agreements). 2) In spoken Chinese, 确认 (quèrèn) is more common for 'confirm' in casual settings. 3) As a verb, it typically requires an object (e.g., 'confirm a plan' → 确定计划).