protolanguage

/ˌproʊtoʊˈlæŋɡwɪdʒ/
noun
  1. A hypothetical, reconstructed language from which a group of related languages are believed to have developed.
    • Linguists have reconstructed the protolanguage of the Indo-European family.
    • The sounds of a protolanguage are inferred by comparing words from its daughter languages.
    • Learning about protolanguage helps us understand how ancient people communicated.
  2. An early, simple system of communication used by pre-human ancestors, consisting of basic sounds or gestures.
    • Some researchers think protolanguage involved hand gestures before spoken words.
    • A protolanguage would have had a small vocabulary and no complex grammar.
    • The idea of protolanguage explains how early hominins might have shared simple warnings.