ADJUNCTIVE is a 10 letter word that starts with A.

1. \Ad*junc"tive\, a. [L. adjunctivus, fr. adjungere.
   See {Adjunct}.]
   Joining; having the quality of joining; forming an adjunct.
   
   

2. \Ad*junc"tive\, n.
   One who, or that which, is joined.