suffix

n. affix added on to the end of a word; word part added to the end of a word to change its meaning (Grammar)

v. add an affix to the end of a word so as to alter its meaning (Grammar)

In grammar, a suffix — a form of affix — follows the morpheme to which it attaches. Suffixes can be inflectional or derivational.An inflectional suffix is sometimes called a desinence.Suffixes appear as additions at the end of a word or at the end of part of a word.
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n. suffix, ending

n. extension, suffix

(v. t.)
To add or annex to the end, as a letter or syllable to a word; to append.
  

(n.)
A subscript mark, number, or letter. See Subscript, a.
  

(n.)
A letter, letters, syllable, or syllables added or appended to the end of a word or a root to modify the meaning; a postfix.