An - definition of an by The Free Dictionary
https://www.thefreedictionary.com/an
Weban- 1 , a prefix occurring orig. in loanwords from Greek, with the meanings “not,” “without,” “lacking” ( anaerobic; anhydrous; anonymous ); regularly attached to words or stems beginning with a vowel or h.Compare a- 6. [< Greek] an- 2 , var. of ad- before n: announce. an- 3 , var. of ana- before a vowel: anion. -an 1 ,
DA: 30 PA: 82 MOZ Rank: 32