Definition of “significant” - English Dictionary

“significant” in British English

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significantadjective

uk /sɪɡˈnɪf.ɪ.kənt/ us /sɪɡˈnɪf.ə.kənt/

significant adjective (IMPORTANT)

B2 important or noticeable:

There has been a significant increase in the number of women students in recent years.
The talks between the USA and the USSR were very significant for the relationship between the two countries.

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significant adjective (SPECIAL MEANING)

having a special meaning:

She looked at him across the table and gave him a significant smile.
Do you think it's significant that he hasn't replied to my letter yet?

(Definition of “significant” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“significant” in American English

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significantadjective

us /sɪɡˈnɪf·ɪ·kənt/

important, large, or great, esp. in leading to a different result or to an important change:

This election reaffirms a significant shift of the center of power.
Marriage is a significant commitment.
significance
noun [ U ] us /sɪɡˈnɪf·ɪ·kəns/

The full significance of space exploration may not be understood for many years to come.

(Definition of “significant” from the Cambridge Academic Content Dictionary © Cambridge University Press)