significant

UK: /sɪgˈnɪfɪkənt/ US: /sɪgˈnɪfɪkənt/ ,(sig nif′i kənt)

WordReference Random House Learner's Dictionary of American English © 2025

sig•nif•i•cant /sɪgˈnɪfɪkənt/   adj. 

1. important;
   of consequence:
   a significant event in world history.
2. having a special, secret, or disguised meaning:
   She gave him a significant wink.

sig•nif•i•cant•ly, adv. See -sign-.

WordReference Random House Unabridged Dictionary of American English © 2025

sig•nif•i•cant  (sig nif′i kənt), adj. 

1. important;
   of consequence.
2. having or expressing a meaning;
   indicative;
   suggestive:
   a significant wink.
3. Statistics of or pertaining to observations that are unlikely to occur by chance and that therefore indicate a systematic cause.

n. 

4. something significant;
   a sign.

• Latin significant- (stem of significāns), present participle of significāre to signify; see -ant
• 1570–80

sig•nif′i•cant•ly, adv. 
Synonyms

• 1. consequential, momentous, weighty.
• 2. See expressive. 

Collins Concise English Dictionary © HarperCollins Publishers::

significant / sɪɡˈnɪfɪkənt/ adjective

1. having or expressing a meaning; indicative
2. having a covert or implied meaning; suggestive
3. important, notable, or momentous
4. of or relating to a difference between a result derived from a hypothesis and its observed value that is too large to be attributed to chance and that therefore tends to refute the hypothesis

Etymology: 16th Century: from Latin significāre to signify

sigˈnificantly adverb