Routledge Dictionary of Language and Linguistics
dual [Lat. dualis ‘relating to two persons or things’]
Subcategory of number which indicates elements appearing in pairs as opposed to single elements (singular) or more than two elements (plural).
Remnants of the dual, which was originally fully operative in Indo-European, can be found in Greek, Indo-Iranian, and Gothic in the personal pronouns (e.g. Goth. nominative weis ‘we’ vs wit ‘we two’), as well as in some Slavic languages.
References
number
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