differ

Etymology 1

From Middle English differren, from Old French differer, from Latin differō (“carry apart, put off, defer; differ”), from dis- (“apart”) + ferō (“carry, bear”). Compare Ancient Greek διαφέρω (diaphérō). Doublet of defer (etymology 1).

verb

1. (intransitive) Not to have the same traits or characteristics; to be unalike or distinct.
   These shoes only differ from those ones in having slightly longer laces.
2. (intransitive, people, groups, etc.) To have diverging opinions, disagree.
   May 11, 1827, George Canning, Changes in the Administration I differ from the honourable baronet on both these subjects
3. (intransitive) To be separated in quantity.
   The numbers 3 and 21 differ by 18.

Etymology 2

From diff + -er.

noun

1. (computing) A program that diffs, a diff.