Merriam-Webster Collegiate Dictionary - affix

 I. transitive verb  Etymology: Latin ~us, past participle of affigere to fasten to, from ad- + figere to fasten — more at fix  Date: 1533  1. to attach physically ~ a stamp to a letter  2. to attach in any way ; add, append ~ a signature to a document  3. impress ~ed my seal  Synonyms: see fasten  • ~able adjective  • ~ation noun  • ~ment noun  II. noun  Date: 1612  1. one or more sounds or letters occurring as a bound form attached to the beginning or end of a word, base, or phrase or inserted within a word or base and serving to produce a derivative word or an inflectional form  2. appendage  • ~al or ~ial adjective AFFIXABLE  adjective see affix I