Suffix (noun)

1. A morpheme added at the end of a word to form a derivative word or to change the grammatical function of the original word.
2. An affix or series of affixes added to the end of a word to change its meaning or form.

Origin:

Derived from the latin word 'suffixum' (something added), which is a combination of 'sub' (under) and 'figere' (to fasten).

Examples:

1. The suffix '-ment' added to the word 'entertain' forms the noun 'entertainment'.
2. The suffix '-ness' added to the word 'happy' forms the noun 'happiness'.
3. The suffix '-less' added to the word 'hopeful' forms the adjective 'hopeless'.
4. The suffix '-ful' added to the word 'use' forms the adjective 'useful'.
5. The suffix '-ish' added to the word 'green' forms the adjective 'greenish'.