To merge, to intermingle freely.
To form from different pieces or elements.
To bond pieces of metal into a continuous whole by liquefying parts of each piece, bringing the liquids into contact, and allowing the combined liquid to solidify.
To join into a single mass or whole.
A program that diffs, a diff.
Not to have the same traits or characteristics; to be unalike or distinct.
To have diverging opinions, disagree.
To be separated in quantity.