C3

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Initialism of command, control, and communications. abbreviation, alt-of, initialism, uncountable
  2. 2
    Ellipsis of 501(c)(3) abbreviation, alt-of, ellipsis
  3. 3
    Envelope size, 324 x 458 mm wordnet

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.