SIGNIFICANT
significant
Noun
- That which has significance; a sign; a token; a symbol.
 
Adjective
- Signifying something; carrying meaning.
- a significant word or sound; a significant look
 
 - Having a covert or hidden meaning.
 - Having a noticeable or major effect; notable.
- That was a significant step in the right direction.
 - The First World War was a significant event.
 
 - Reasonably large in number or amount.
 - Having a low probability of occurring by chance (for example, having high correlation and thus likely to be related).
 
The above text is a snippet from Wiktionary: significant
and as such is available under the Creative Commons Attribution/Share-Alike License.