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Morphology

The basis of Sanskrit morphology is the root, states Jamison, "a morpheme bearing lexical meaning". The verbal and nominal stems of Sanskrit words are derived from this root through the phonological vowel-gradation processes, the addition of affixes, verbal and nominal stems. It then adds an ending to establish the grammatical and syntactic identity of the stem. According to Jamison, the "three major formal elements of the morphology are (i) root, (ii) affix, and (iii) ending; and they are roughly responsible for (i) lexical meaning, (ii) derivation, and (iii) inflection respectively".

A Sanskrit word has the following canonical structure:

The root structure has certain phonological constraints. Two of the most important constraints of a "root" is that it does not end in a short "a" (अ) and that it is monosyllabic. In contrast, the affixes and endings commonly do. The affixes in Sanskrit are almost always suffixes, with exceptions such as the augment "a-" added as prefix to past tense verb forms and the "-na/n-" infix in single verbal present class, states Jamison.

Sanskrit verbs have the following canonical structure:

According to Ruppel, verbs in Sanskrit express the same information as other Indo-European languages such as English. Sanskrit verbs describe an action or occurrence or state, its embedded morphology informs as to "who is doing it" (person or persons), "when it is done" (tense) and "how it is done" (mood, voice). The Indo-European languages differ in the detail. For example, the Sanskrit language attaches the affixes and ending to the verb root, while the English language adds small independent words before the verb. In Sanskrit, these elements co-exist within the word.

Both verbs and nouns in Sanskrit are either thematic or athematic, states Jamison. Guna (strengthened) forms in the active singular regularly alternate in athematic verbs. The finite verbs of Classical Sanskrit have the following grammatical categories: person, number, voice, tense-aspect, and mood. According to Jamison, a portmanteau morpheme generally expresses the person-number-voice in Sanskrit, and sometimes also the ending or only the ending. The mood of the word is embedded in the affix.

These elements of word architecture are the typical building blocks in Classical Sanskrit, but in Vedic Sanskrit these elements fluctuate and are unclear. For example, in the Rigveda preverbs regularly occur in tmesis, states Jamison, which means they are "separated from the finite verb". This indecisiveness is likely linked to Vedic Sanskrit's attempt to incorporate accent. With nonfinite forms of the verb and with nominal derivatives thereof, states Jamison, "preverbs show much clearer univerbation in Vedic, both by position and by accent, and by Classical Sanskrit, tmesis is no longer possible even with finite forms".

While roots are typical in Sanskrit, some words do not follow the canonical structure. A few forms lack both inflection and root. Many words are inflected (and can enter into derivation) but lack a recognizable root. Examples from the basic vocabulary include kinship terms such as mātar- (mother), nas- (nose), śvan- (dog). According to Jamison, pronouns and some words outside the semantic categories also lack roots, as do the numerals. Similarly, the Sanskrit language is flexible enough to not mandate inflection.

The Sanskrit words can contain more than one affix that interact with each other. Affixes in Sanskrit can be athematic as well as thematic, according to Jamison. Athematic affixes can be alternating. Sanskrit deploys eight cases, namely nominative, accusative, instrumental, dative, ablative, genitive, locative, vocative.

Stems, that is "root + affix", appear in two categories in Sanskrit: vowel stems and consonant stems. Unlike some Indo-European languages such as Latin or Greek, according to Jamison, "Sanskrit has no closed set of conventionally denoted noun declensions". Sanskrit includes a fairly large set of stem-types. The linguistic interaction of the roots, the phonological segments, lexical items and the grammar for the Classical Sanskrit consist of four Paninian components. These, states Paul Kiparsky, are the Astadhyaayi, a comprehensive system of 4,000 grammatical rules, of which a small set are frequently used; Sivasutras, an inventory of anubandhas (markers) that partition phonological segments for efficient abbreviations through the pratyharas technique; Dhatupatha, a list of 2,000 verbal roots classified by their morphology and syntactic properties using diacritic markers, a structure that guides its writing systems; and, the Ganapatha, an inventory of word groups, classes of lexical systems. There are peripheral adjuncts to these four, such as the Unadisutras, which focus on irregularly formed derivatives from the roots.

Sanskrit morphology is generally studied in two broad fundamental categories: the nominal forms and the verbal forms. These differ in the types of endings and what these endings mark in the grammatical context. Pronouns and nouns share the same grammatical categories, though they may differ in inflection. Verb-based adjectives and participles are not formally distinct from nouns. Adverbs are typically frozen case forms of adjectives, states Jamison, and "nonfinite verbal forms such as infinitives and gerunds also clearly show frozen nominal case endings".