(1) See
offset press.
(2) The distance from a starting point, either the start of a file or the start of a memory address. Its value is added to a base value to derive the actual value. An offset into a file is simply the character location within that file, usually starting with 0; thus "offset 240" is actually the 241st byte in the file. See
relative address.
(3) In word processing, the amount of space a document is printed from the left margin.