responder

noun

Etymology: Etymology tree English respond Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English responder From respond + -er.

1. One who responds.

   “As Levinson (1983: 334) points out, signs of dispreference in turn taking include: (a) Delays: notably a pause, or a time gap, before the responder replies to the preceding turn […]”

2. A person who responds to an emergency situation or other summons.

   “911 responders arrived at the scene within five minutes after the call.”