in writing Definition

1. Written or printed words.
2. Handwriting.

Thesaurus: calligraphy, scribble, script, scrawl.
3a. A literary composition;

Thesaurus: publication, opus, work, composition.
3b. The art or activity of literary composition.

Thesaurus: letters, composition, penmanship.
4. Literary work.

Thesaurus: literature, letters, belles-lettres, work.
Form: writings (usually)
5. A form of script.

Example: Chinese writing

Said of a promise or other commitment: in written form, especially as being firm proof of intention, etc.