n. The addition of a sound, syllable or letter to the end of a word, either through natural development or as a grammatical function.
the GNU version of the Collaborative International Dictionary of English
n. The addition of a letter or syllable to the end of a word, as withouten for without.
n. Coaptation.
The Century Dictionary and Cyclopedia
n. The addition, by growth or accident, of a non-significant letter or syllable to the end of a word: opposed to prosthesis and apocope. Examples are len-d, amongs-t, agains-t, whils-t, tyran-t. Also called epithesis and ectasis.
Word Usage
"For paragoge it is not easy to give an equivalent; it is leading or bringing with a notion of change, sometimes a change into error, as when it means a quibble."