Definitions of truncate:

• verb:   replace a corner by a plane
• verb:   make shorter as if by cutting off

  Example: "Truncate a word"

• verb:   approximate by ignoring all terms beyond a chosen one

  Example: "Truncate a series"

• adjective:   terminating abruptly by having or as if having an end or point cut off

  Example: "A truncate leaf"