The Jargon File (version 4.4.7, 29 Dec 2003):

newline
 /n[y]oo'li:n/, n.

    1. [techspeak, primarily Unix] The ASCII LF character (0001010), used under
    Unix as a text line terminator. Though the term newline appears in ASCII
    standards, it never caught on in the general computing world before Unix.

    2. More generally, any magic character, character sequence, or operation
    (like Pascal's writeln procedure) required to terminate a text record or
    separate lines. See crlf.


The Free On-line Dictionary of Computing (30 December 2018):

newline

    /n[y]oo'li:n/ Line feed or other
   character sequence used to terminate a line of text.

   Unix uses line feed as its text line terminator - a
   Bell-Labs-ism rather than a Berkeleyism.  Interestingly
   (and unusually for Unix jargon), it is said to have originally
   been an IBM usage.  Though the term "newline" appears in
   ASCII standards, it never caught on in the general
   computing world before Unix.  The encoding of line feed as
   "\n" in C and Unix strings comes from this name.

   The term has been used more generally for any end of line
   character, character sequence (e.g. crlf), or operation
   (like Pascal's writeln procedure or Lisp 1.5's terpri)
   required to terminate a text record or separate lines.

   [Jargon File]

   (1997-07-14)