proto

Adjective
  1. Indicating the first or earliest or original (synset 300819155)
    "`proto' is a combining form in a word like `protolanguage' that refers to the hypothetical ancestor of another language or group of languages"
    domain usage: combining form - a bound form used only in compounds
    similar to: early - at or near the beginning of a period of time or course of events or before the usual or expected time

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