Read the dictionary definition of truncate. All definitions for this word.
1. make shorter as if by cutting off
1. truncate a word
2. Erosion has truncated the ridges of the mountains
2. approximate by ignoring all terms beyond a chosen one
1. truncate a series
3. replace a corner by a plane
4. terminating abruptly by having or as if having an end or point cut off
1. a truncate leaf
2. truncated volcanic mountains
3. a truncated pyramid