Definitions of typo on the Web:
* an abbreviation for typographical error. An error in the typeset copy.
www.purdue.edu/printingservices/support/glossary/glossrtoz.htm
* abbrev, typographical error, typically an error in typeset, but now commonly used to denote observation of a spelling error
open-site.org/Arts/Literature/Typography/Terminology/
* Slang for typographical error
www1.thetimesnews.com/tn_nie/terms.html
* abbreviation for typographical error; any unintentional mistake on the part of the operator resulting in misspelling or misplacement of type
www.gtscompanies.com/printp_z.html
* misprint: a mistake in printed matter resulting from mechanical failures of some kind
wordnet.princeton.edu/perl/webwn
* A typographical error or "typo" is a mistake made during the typing process. This excludes errors of ignorance, rather being the result of slips of the hand or finger, or in some cases, mechanical failure. Typographical errors typically manifest in the form of an additional or missing character, or the switching of two characters.