Morpheme

/ˈmɔːrfiːm/
Formal Definition

The smallest unit of meaning in a language. It cannot be divided further without losing meaning.

Analysis of "Unbreakable"
un- + break + -able
Root Morpheme
"Break" (Free Morpheme)
Affix Morpheme
"-able" (Bound Morpheme)
Indivisible Hierarchy Level
Meaningful Primary Attribute
Allomorphs Variant Forms