An Elephant in the wild is big game. An Elephant in the zoo is a document.

A document is a collection of data recorded on a data carrier. By providing context this data becomes information.
This can be in “writing”, on pyramids/ temples, clay tablets, parchment, stone, canvas, paper, microchip or digitally. The definition of a document is not restricted to writing/ text (such as letters, memos, manuscripts, certificates, bills, hospital records, political programs, and event logs). A spreadsheet containing numbers, or a PowerPoint presentation with pictures is also a document. A drawing of a building (the creation of an architect) is as much a document as a legal paper. The collected works of Rembrand or Vincent van Gogh provide in a view on an era. They are documents too. 

In general, a document (noun) is a record or the capturing of some event or thing so that the information will not be lost. A document usually adheres to some convention based on similar or previous documents or specified requirements. 

Back to data, recorded on a data carrier. A cemetery with gravestones presents a lot of data on high-quality carriers, in its context, it becomes a memorial of events. The tombstones at Ypres or Arlington are historical documents. 

A document is a form of information. A document can be put into an electronic form and stored in a computer as one or more file s. Often a single document becomes a single file. An entire document or individual parts may be treated as individual data items. As files or data, a document may be part of a database. Electronic Document Management ( EDM ) deals with the management of electronically-stored documents. 

When using certain computer application programs such as a word processor, a document is the unit of saved work. Each document is saved as a uniquely named file. A unit of a document, in IT, is commonly referred too as a content item or an information object. 

In the computer industry, documentation is the information provided to a customer or other users about a product or the process of preparing it.

2) To document (verb) a fact, event, or other thing is to record or annotate it, meaning to put it into some relatively permanent form so that it can be retrieved later.

An Elephant in the wild is big game. An Elephant in the zoo is a document

A historian that iI know.
Working for a client as a documentalist
A story of a generation. Chizzled in marble

A definition should not be a straightjacket.