Ending (noun)

1. The final part or conclusion of something.
2. The last part of a word, particularly the last syllable.

Origin:

From middle english endyng, from old english endung, from endian ("to bring to an end"), from ende ("end") + -ung (suffix forming verbal nouns).

Examples:

1. The movie had a happy ending.
2. The book's ending was a surprise.
3. The ending of the war was celebrated.
4. The word "ending" has three letters in its ending.
5. The ending of the story was left open.