What is the meaning of truncate?

verb

• Replace a corner by a plane.
• Approximate by ignoring all terms beyond a chosen one.
  • usage: "truncate a series"
• Make shorter as if by cutting off.
  • usage: "truncate a word"; "Erosion has truncated the ridges of the mountains"
  • synonyms: cut short

adjective

• Terminating abruptly by having or as if having an end or point cut off.
  • usage: "a truncate leaf"; "truncated volcanic mountains"; "a truncated pyramid"
  • synonyms: truncated