noun

• (computing) A file that contains text.
  "That exception is the HTML <IMG> tag–which transcludes an image into the context of the document. The image itself is neither embedded within the document nor copied—it is transcluded."
• (information science) An object conveying information by whatever means, capable of being indexed alongside other similar objects.
  "This study examines video game photography as a documentary practice. […] The three themes from this study's findings – that video game photographs act as (1) vehicles for storytelling, (2) creative trophies, and (3) aesthetic tokens – reveal how personally meaningful documents emerge from this medium."
• (obsolete) That which is taught or authoritatively set forth; precept; instruction; dogma.
  "And particularly they should take care that the memory of the learner be not too much crowded with a tumultuous heap or overbearing multitude of documents or ideas at one time."
• (obsolete) An example for instruction or warning.
  "They were forthwith stoned to death, as a document to others."