The Altaic languages (Turkic, Mongolic, Tungusic) are spread across Eurasia, from Central Asia to the Middle East and the Balkans. The genetic affinity between these subgroups has not been definitively established but the commonality among features and patterns points to some linguistic connections. The main morphological operations in Altaic languages are suffixation and compounding. Generally regarded as morphologically regular with easily identifiable suffixes in which there are clear form-meaning correspondences, the languages, nevertheless, show irregularities in many domains of the phonological exponents of morphosyntactic features, such as base modification, cumulative exponence, and syncretism.
Nouns are inflected for number, person, and case. Case markers can express structural relations between noun phrases and other constituents, or they can act as adpositions. Only very few of the Altaic languages have adjectival inflection. Verbs are inflected for voice, negation, tense, aspect, modality, and, in most of the languages subject agreement, varying between one and five person-number paradigms. Subject agreement is expressed through first, second, and third persons singular and plural. In the expression of tense, aspect, and modality, Altaic languages employ predominantly suffixing and compound verb formations, which involve auxiliary verbs.
Inflected finite verbs can stand on their own and form propositions, and as a result, information structure can be expressed within a polymorphic word through prosodic means. Affix order is mostly fixed and mismatches occur between morpholotactic constraints and syntactico-semantic requirements. Ellipsis can occur between coordinated words.
Derivational morphology is productive and occurs between and within the major word classes of nominals and verbs. Semantic categories can block other semantic categories.