Two meanings A and B are said to be synexpressed if they are expressed simultaneously by a minimal form (a morph).
Two subtypes of synexpression are syllexification and syngrammification. These three terms were first proposed by Haspelmath (2023).
fusion (STR) = a highly grammaticalized strategy for encoding the relation in major propositional acts (modifier–referent, predicate–argument), in which the two elements are fused in a single morpheme. Example: Lakhota ina ‘my mother’ fuses ‘my’ and ‘mother.’ (Section 4.5) ❡ cumulation = the expression of multiple “grammatical” (not lexical) meanings in a single morpheme. Example: English -s in She sing-s cumulates third person, singular number, and present tense in a single morpheme. (Sections 1.6, 4.4.1)