The Collaborative International Dictionary of English v.0.48:

ergonomics \ergonomics\ n.
   biological science applied to study the relation between
   workers and their environments.

   Syn: biotechnology, bioengineering.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

ergonomics
    n 1: the branch of engineering science in which biological
         science is used to study the relation between workers and
         their environments [syn: biotechnology, bioengineering,
         ergonomics]

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

ergonomics

   The study of the design and arrangement of equipment so that
   people will interact with the equipment in healthy,
   comfortable, and efficient manner.  As related to computer
   equipment, ergonomics is concerned with such factors as the
   physical design of the keyboard, screens, and related
   hardware, and the manner in which people interact with these
   hardware devices.

   (1995-04-14)