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decline  (declines plural & 3rd person present) (declining present participle) (declined past tense & past participle )
1  verb If something declines, it becomes less in quantity, importance, or strength. 
The number of staff has declined from 217,000 to 114,000...  V from/to/by amount 
2  verb If you decline something or decline to  do something, you politely refuse to accept it or do it. 
FORMAL He declined their invitation...  V n 
3  n-var If there is a decline in something, it becomes less in quantity, importance, or quality. 
There wasn't such a big decline in enrollments after all...  
4 If something is in decline or on the decline, it is gradually decreasing in importance, quality, or power. 
in decline/on the decline  phrase 
Thankfully the smoking of cigarettes is on the decline...  
5 If something  goes or  falls into decline, it begins to gradually decrease in importance, quality, or power. 
into decline  phrase 
Libraries are an investment for the future and they should not be allowed to fall into decline.