Source : WordNet®

text file
     n : (computer science) a computer file that contains text (and
         possibly formatting instructions) using 7-bit ASCII
         characters [syn: {document}]

Source : Free On-Line Dictionary of Computing

text file
     
         A {file} containing no "invisible" {control
        characters}, only {printable} letters, numbers and symbols,
        usually from the {ASCII} {character set}.
     
        A text file can be produced with a {text editor} and can
        usually be imported into any {word processor} though it will
        probably appear unformatted.
     
        Compare {binary file}, {flat file}, {rich text file}.
     
        (1996-11-15)