Alpha privative

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An alpha privative or, rarely,[1] privative a (from Latin alpha prīvātīvum, from Ancient Greek α στερητικόν) is the prefix a- or an- (before vowels) that is used in Greek and in English words borrowed from Greek to express negation or absence, for example atypical, anesthetic, and analgesic.

It is derived from a Proto-Indo-European syllabic nasal *n̥-, the zero ablaut grade of the negation *ne, i.e. /n/ used as a vowel. For this reason, it usually appears as an- before vowels (e.g. an-alphabetism, an-esthesia, an-archy).[2] It shares the same root with the Greek prefix or ne, in Greek νη or νε, that is also privative (e.g. ne-penthe).[3]



The same prefix appears in Sanskrit, also as a-, an-


In Latin, the cognate prefix is in-. The prepositional prefix in- is unrelated.

Germanic languages[edit]

In English and other West Germanic languages, the cognate is un- (or on-).

In North Germanic languages, the -n- has disappeared and Old Norse has ú- (e.g. ú-dáins-akr), Danish and Norwegian have u-, whereas Swedish uses o- (pronounced [u]), and Icelandic and Faroese use the related ó-.


The prefix ἁ- ha- (also ἀ- a- from psilosis), copulative a, is nearly homonymous with privative a, but originates from Proto-Indo-European *sm̥.[2]

See also[edit]