on file Definition

file¹
noun

1. A folder or box in which to keep loose papers.

Thesaurus: repository, folder, portfolio, binder, dossier.
2. A collection of papers so kept, especially dealing with a particular subject.
3. computing.
An organized collection of data that is stored in the external memory of a computer, and can be accessed and manipulated as a single named unit.
4. A line of people or things, especially soldiers, positioned or moving one behind the other.

Example: single file
Thesaurus: line, rank, row, column, list, procession, queue, cortege, string, trail, stream.
5. chess.
Any of the eight lines of squares extending across the chessboard from player to player. Compare rank¹.

verb filed, filing

1. To put (papers, etc) into a file.

Thesaurus: classify, index, categorize, catalogue, record, register, list, arrange, pigeonhole, docket.
Form: file something away (often)
2. To make a formal application to a law court on (a specified matter).

Example: file a complaint
Example: file for divorce
Form: file for something (often)
3. To place (a document) on official or public record.
intr
4. To march or move along one behind the other.

Example: The soldiers filed onto the square
5. Said of a reporter: to submit (a story) to a newspaper.

Derivative: filer
noun

Derivative: filed
adj

Derivative: on file
noun

Retained in a file ( 1 or 3 above) for reference; on record.

Etymology: 16c: from Latin filum a thread, originally referring to a string or wire on which papers were hung.