Input/output devices designed to receive data in an environment associated with the job to be performed, and capable of transmitting entries to, and obtaining output from, the system of which it is a part. (Computer Dictionary, 4th ed.)
A reference book containing a list of words - usually in alphabetical order - giving information about form, pronunciation, etymology, grammar, and meaning. A foreign-language dictionary is an alphabetical list of words of one language with their meaning and equivalents in another language.