
Inflectional endings number among the minimal units of meaning (morphemes) that make up words, which in Proto-Indo-European began with a root. Endings encode person & number for verbs, case, number & gender (noun class) for nouns or adjectives, and case & number for pronouns.
Endings are inflectional, but because PIE morphological structures are both inflectional and fusional, it is seldom possible to identify a morpheme for case & person distinct from number.