tɹʌŋˈkeɪt ˈtɹʌŋˌkeɪt tɹʌŋˈkeɪt ˈtɹʌŋˌkeɪt make shorter as if by cutting off truncate a word Erosion has truncated the ridges of the mountains approximate by ignoring all terms beyond a chosen one truncate a series terminating abruptly by having or as if having an end or point cut off a truncate leaf truncated volcanic mountains a truncated pyramid replace a corner by a plane