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significant

sig·nif·i·cant [ sig níffikənt ]


adjective 
Definition:
 
1. meaningful: having or expressing a meaning

2. communicating secret meaning: having a hidden or implied meaning
a significant nod of the head

3. momentous and influential: having a major or important effect
a significant idea

4. substantial: relatively large in amount
Her work was a significant contribution to the project.

5. statistics occurring not merely by chance: relating to the occurrence of events or outcomes that are too closely linked statistically to be mere chance

[Late 16th century. < Latin significant-, present participle of significare (see signify)]
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