In linguistics, a marker is a free or bound morpheme that indicates the grammatical function of the marked word, phrase, or sentence.More characteristically, markers occur as clitics or inflectional affixes. In analytic languages and agglutinative languages, markers are generally easily distinguished.In fusional languages and polysynthetic languages, this is often not the case.or example, in Latin, a highly fusional language, the word amo (I love) is marked by suffix-o for indicative mood, active voice, first person, singular, present tense. Analytic languages tend to have a relatively limited number of markers. Markers should be distinguished from the linguistic concept of markedness.