append

Short definition from Wiktionary

Verb

1. 1
   To hang or attach to, as by a string, so that the thing is suspended
2. 2
   To add, as an accessory to the principal thing; to annex
3. 3
   To write more data to the end of a pre-existing file, string, or other object.

Noun

1. 1
   An instance of writing more data to the end of an existing file.