significant

[sig-nif-i-kuhnt]
adjective
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.
noun
4.
something significant; a sign.

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

significantly, adverb
nonsignificant, adjective
nonsignificantly, adverb
supersignificant, adjective
supersignificantly, adverb
unsignificant, adjective
unsignificantly, adverb


1. consequential, momentous, weighty. 2. See expressive.
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World English Dictionary
significant (sɪɡˈnɪfɪkənt)
 
adj
1.  having or expressing a meaning; indicative
2.  having a covert or implied meaning; suggestive
3.  important, notable, or momentous
4.  statistics 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
 
[C16: from Latin significāre to signify]
 
sig'nificantly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

significant
1570s, from L. significant-, stem of significans, prp. of significare (see signify).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The advantages of living in a state park significantly outweigh the
  disadvantages.
But if growth is progressing significantly out of bounds, you may have to dig
  out the portions that have gone too far.
Recycling as much of your household garbage as possible can significantly
  reduce your contribution to landfills.
The vast majority of them will live in urban areas, and will have a
  significantly higher average age than people today.
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