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significant

Use the adjective significant to describe something that is important. Your "significant other" means the person who's most important in your life. A significant result in a scientific study is a result large enough to matter.

A less common meaning of significant is to describe something that has a special or hidden meaning. A significant smile can convey feelings or information without words. This adjective is from Latin significans, from significare "to signify," from signum "a sign, mark" plus facere "to make."

DEFINITIONS OF: significant

1

adj rich in significance or implication

Synonyms:
meaning, pregnant
meaningful
having a meaning or purpose

adj important in effect or meaning

“a significant change in tax laws”
“a significant change in the Constitution”
“a significant contribution”
“significant details”
“statistically significant”
Synonyms:
important
important, of import
of great significance or value
meaningful
having a meaning or purpose
momentous
of very great significance
epoch-making, epochal
highly significant or important especially bringing about or marking the beginning of a new development or era
earthshaking, world-shaking, world-shattering
sufficiently significant to affect the whole world
evidential, evidentiary
serving as or based on evidence
fundamental, profound
far-reaching and thoroughgoing in effect especially on the nature of something
large
fairly large or important in effect; influential
monumental
of outstanding significance
noteworthy, remarkable
worthy of notice
probative, probatory
tending to prove a particular proposition or to persuade you of the truth of an allegation
operative
effective; producing a desired effect
portentous, prodigious
of momentous or ominous significance
Antonyms:
insignificant, unimportant
devoid of importance, meaning, or force
unimportant
not important
meaningless, nonmeaningful
having no meaning or direction or purpose
hole-and-corner, hole-in-corner
relating to the peripheral and unimportant aspects of life
flimsy, fragile, slight, tenuous, thin
lacking substance or significance
inappreciable
too small to make a significant difference
light
having little importance
superficial, trivial
of little substance or significance
show more antonyms...

adj fairly large

Synonyms:
substantial
considerable
large or relatively large in number or amount or extent or degree

adj too closely correlated to be attributed to chance and therefore indicating a systematic relation

“the interaction effect is significant at the .01 level”
“no significant difference was found”
Antonyms:
nonsignificant
attributable to chance
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