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English definition of “significant”

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significant

adjective uk   /sɪɡˈnɪf.ɪ.kənt/ us  

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 Learners Dictionary & Thesaurus © Cambridge University Press)
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