D defs.my
Entry 3 senses Webster, 1913

Truncation

/trŭng'-kāshˌ-ən/ · Trun·ca·tion · IPA /tɹʌŋˈkeɪʃən/
01 n. The act of truncating, lopping, or cutting off.
  1. 1.
    The act of truncating, lopping, or cutting off.
  2. 2.
    The state of being truncated.
  3. 3.
    The replacement of an edge or solid angle by a plane, especially when the plane is equally inclined to the adjoining faces.(Min.)