enthusiastic; ardent; dedicated; keen: an avid moviegoer.
2.
keenly desirous; eager; greedy (often fol. by for or of): avid for pleasure; avid of power.
Origin: 1760–70; < L avidus, equiv. to av(ēre) to crave + -idus-id4
Related forms:
av⋅id⋅ly, adverb
av⋅id⋅ness, noun
Synonyms: Avid,eager,keen all share the sense of strongly desirous. Avid suggests a desire akin to greed, so strong as to be insatiable: driven by an avid need for fame and recognition. Eager implies a desire that is strong and impatient but less than overpowering: eager to try his hand at new tasks. Keen carries a sense of zest and active, alert desire: an amateur painter, ever keen to try new techniques.
1769, from Fr. avide, from L. avidus "longing eagerly for," from avere "to desire eagerly." Also in part a back-formation from avidity (1449), from M.Fr. avidité, from L. aviditatem, noun of quality from avidus.
[av-id] 
ɪd