a device that indicates reception of a signal; specif., transponder
responder in American English
(rɪˈspɑndər)
noun
1.
a person or thing that responds
2. Electronics
the part of a transponder that transmits the reply
Word origin
[1875–80; respond + -er1]This word is first recorded in the period 1875–80. Other words that entered Englishat around the same time include: Diaspora, cross-fertilization, graph, knockabout, slime mold-er is a suffix used in forming nouns designating persons from the object of their occupationor labor (hatter; tiler; tinner; moonshiner), or from their place of origin or abode (Icelander; southerner; villager), or designating either persons or things from some special characteristic or circumstance(six-footer; three-master; teetotaler; fiver; tenner)
Examples of 'responder' in a sentence
responder
You as responder have support for both -which to choose?
Times, Sunday Times (2006)
She picked her out as a 'responder'.
Times, Sunday Times (2012)
We are nearing the end of our series on responder.
Times, Sunday Times (2010)
And not everyone is a 'caffeine responder': individual responses to doses vary enormously.
Times, Sunday Times (2014)
You are a social worker but you are also a first responder.
Times, Sunday Times (2018)
Studies have shown that the actions of the first responder often determine the outcome.