Current usage of the term "weak suppletion" in synchronic morphology is not fixed. Pame grammar is characterized by complex morphophonemics and suppletion. It has agglutinative verbal morphology, with extensive suppletion. They are formed from other imperfective verbs by stem alternations or suppletion, ex. In historical linguistics "suppletion" is sometimes limited to reference to etymologically unrelated stems. Some nouns form their plural with suppletion. In Imonda, transitive verbs agree with subjects in number by vowel raising or suppletion. The grammatical processes involved in verbal inflection in Totonac include affixation, suppletion, and cliticization. The term "suppletion" refers to allomorphy of an open-class lexical item. Shoshoni verbs may mark for number, mainly through reduplication or suppletion. Another class of works form their plurals by suppletion. These categories, where marked, are largely marked by partial or full suppletion. An incomplete suppletion in English exists with the plural of "person" (from the Latin ). Vowel alternances are active, as well as infixation and suppletion. A small group of imperfective-perfective pairs results from suppletion.