affix

Short definition from Wiktionary

Noun

1. 1
   A bound morpheme added to a word’s stem, such as a prefix or suffix.
2. 2
   That which is affixed; an appendage.
3. 3
   The complex number a+bi associated with the point in the Gauss plane with coordinates (a,b).
4. 4
   Any small feature, as a figure, a flower, or the like, added for ornament to a vessel or other utensil, to an architectural feature.

Verb

1. 1
   To attach.
2. 2
   To subjoin, annex, or add at the close or end; to append to.
3. 3
   To fix or fasten figuratively; with on or upon.