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History
History
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Meaning:
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(of interest, the feelings) strong; deep

enthusiastic

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Cases of word usage

1) eager, keen (avid)

2) a machine or instrument used for making a current of air (e.g. to cool a room); a very keen supporter (fan)

3) enthusiastic; keen (the usual words) (zealous)

KEEN as in Wiktionary
KEEN as in Wikipedia