WordNet (r) 3.0 (2006):

information technology
    n 1: the branch of engineering that deals with the use of
         computers and telecommunications to retrieve and store and
         transmit information [syn: information technology, IT]

The Free On-line Dictionary of Computing (30 December 2018):

information technology

    (IT) Applied computer systems - both
   hardware and software, and often including networking
   and telecommunications, usually in the context of a business
   or other enterprise.  Often the name of the part of an
   enterprise that deals with all things electronic.

   The term "computer science" is usually reserved for the more
   theoretical, academic aspects of computing, while the vaguer
   terms "information systems" (IS) or "information services" may
   include more of the human activities and non-computerised
   business processes like knowledge management.  Others say
   that IT includes computer science.

   (2000-10-02)