A Quick and Simple Dictionary

diff

1. Noun.  (slang) (abbreviation of, difference) .
2. Noun.  (computing) Any program which compares two files or sets of files and outputs a description of the differences between them.
3. Noun.  (computing) The output of a diff program. A diff file.
4. Noun.  (medicine) (abbreviation of, differential) : differential of types of white blood cell in a complete blood count.
5. Noun.  (slang) (abbreviation of, difficult) .
6. Noun.  (context, rock climbing) A difficult route.
7. Verb.  (transitive, computing) To run a diff program on (files or items).
8. Verb.  (transitive, computing) To produce a description of changes made to a collection of files. To produce a patch file.
9. Verb.  (transitive, computing) To compare two files or other objects, manually or otherwise.
10. Proper noun.  (computing) A program, historically part of the Unix operating system, which compares two files or sets of files and outputs a description of the differences between them.