Adjective triangular has 3 senses
  1. triangular - having three angles; forming or shaped like a triangle; "a triangular figure"; "a triangular pyrimid has a triangle for a base"
    Antonym:
    rounded (indirect, via angular)
  2. triangular, trilateral, tripartite, three-party, three-way - involving three parties or elements; "the triangular mother-father-child relationship"; "a trilateral agreement"; "a tripartite treaty"; "a tripartite division"; "a three-way playoff"
    Antonyms: bilateral, two-sided (indirect, via unilateral, multilateral)
    Antonyms: unilateral, one-sided (indirect, via multilateral, bilateral)
  3. trilateral, triangular, three-sided - having three sides; "a trilateral figure"
    Antonyms: bilateral, two-sided (indirect, via unilateral, multilateral)
    Antonyms: unilateral, one-sided (indirect, via multilateral, bilateral)
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