The inflection of words to mark changes in meaning or grammatical function, such as the addition of ‘was’ to nouns to mark their plurality. Languages that use a relatively large number of morphological (or inflectional) markings) tend to have no fixed word order. They do so in order to disambiguate the roles of arguments. Somewhat flexible word orders can also occur in languages with a high degree of morphological marking (e.g., Latin, Finnish, Hungarian, Romanian).
See Grammatical marking, Morpheme, Morphology (linguistics), Orthography, Syntax