Ablative case is a case that expresses a variety of meanings including   instrument cause location source, and time.

Absolutive case is the case of nouns in ergative-absolutive languages that would generally be the subjects of intransitive verbs or the objects of transitive verbs in the translational equivalents of [..]

Accusative case is the case in nominative-accusative languages that marks certain syntactic functions, usually direct objects.

Acoustic phonetics is a technical area of linguistics. Phoneticians depict and analyze sound waves using machines and computer programs.

Active voice is a voice that indicates a subject has the semantic function of actor.

Advanced tongue root refers to the features of a sound made by drawing the root of the tongue forward. This feature distinguishes between tense vowels as [+ ATR] and lax vowels as [- ATR] (Burquest an [..]

Affixation is the morphological process whereby an affix is attached to a root or stem.

Agreement refers to a formal relationship between elements whereby a form of one word requires a corresponding form of another.   Also known as: concord

Alethic modality is modality that connotes the speaker’s estimation of the logical necessity or possibility of the proposition expressed by his utterance.

Allative case is a case that expresses motion to or toward the referent of the noun it marks.