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March 24, 2026
一定yídìng(yi2ding4)
一定 (yī dìng) means 'surely' or 'certainly' and indicates a strong degree of certainty or necessity. It is often used to express assurance about an outcome or to emphasize that something must happen or be true. In everyday conversation, it's common to use 一定 to convey commitment or a guarantee.
Frequency#204DifficultyMedium
Cultural Note
In Chinese culture, the concept of certainty is often linked to commitment, especially in business and relationships. Saying 一定 implies reliability and can be vital in negotiations or promises, reflecting the importance of trust.
Memory Tip
Imagine a fixed (定) point (一) in the sky that you can surely reach. The number one (一) represents certainty and the idea that you can definitely get to that point without doubt. Visualize aiming for that fixed star to remember both the meaning and pronunciation.
Meanings of 一定
yídìng(yi2ding4)
1surely
2certainly
Exercise 1 of 2
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About 一定
一定Simplified
—Strokes
—Radical
副形词xíngróngcíadj-adverb (adj.-adv.)Part of Speech
#204Frequency Rank
HSK 2.0L3HSK 3.0L3ElementaryTOCFLL2HSKKL1CEFRA1
Podcast: 一定
Podcast: 一定
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AI Study Notes for 一定
Quick Contrast
一定 (yídìng) vs 必定 (bìdìng) — use 一定 for strong assurance or necessity in a general sense, while 必定 emphasizes a more inevitable outcome.
Memory Mnemonic
Imagine a fixed (定) point (一) in the sky that you can surely reach. The number one (一) represents certainty and the idea that you can definitely get to that point without doubt. Visualize aiming for that fixed star to remember both the meaning and pronunciation.
Usage Notes
Be careful not to confuse 一定 with similar phrases like 可能 (kě néng), which means 'possibly.' 一定 is more assertive and should be used when you are confident something will occur. It is commonly used in both formal and informal contexts, but it can sound overly strong in softer conversations.
HSK Study Tips
As an HSK 3 word, 一定 connects to expressions of certainty, which are important for building confidence in conversation. Students should focus on using it in sentences to express guarantees or strong beliefs, which will help them communicate more effectively.
Cultural Note
In Chinese culture, the concept of certainty is often linked to commitment, especially in business and relationships. Saying 一定 implies reliability and can be vital in negotiations or promises, reflecting the importance of trust.
Common Mistakes
Learners often mistakenly use 一定 in contexts that imply doubt or possibility, such as saying '我一定会去' (I will definitely go) when they are unsure. Instead, use 可能 (kě néng) for uncertain situations.
AI-enhanced 2026-03-24
Pronunciation of 一定
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Grammar Patterns of 一定
一定 functions as an adverb — it modifies a verb, adjective, or another adverb. In Chinese, adverbs sit BEFORE the verb they modify (我也去, 他常常迟到), never after it. It carries 8 related meanings, each with its own usage notes below. The example sentences below show it in action, with practice buttons (Listen, Practice Writing, Practice Speaking) on every line.
In Chinese culture, the concept of certainty is often linked to commitment, especially in business and relationships. Saying 一定 implies reliability and can be vital in negotiations or promises, reflecting the importance of trust.
Frequently Asked Questions about 一定
Yes, you can use 一定 in questions to ask if someone is certain about something, for example, '你一定会来吗?' (Are you definitely coming?).
Yes, 一定 expresses certainty or assurance, while 必须 means 'must' and indicates obligation. Use 必须 when something is required.
You can say, '他一定会成功' (He will definitely succeed) to express strong belief.
