responder

[ri-spon-der]

re·spond·er

[ri-spon-der]
noun
1.
a person or thing that responds.
2.
Electronics. the part of a transponder that transmits the reply.

Origin:
1875–80; respond + -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Responder is always a great word to know.
So is root mean square. Does it mean:
square root of arithmetic mean of squares of the numbers in given set of numbers
time taken for charge to decay to 1 over the natural logarithm of its initial value
Collins
World English Dictionary
respond (rɪˈspɒnd)
 
vb (foll by to)
1.  to state or utter (something) in reply
2.  (intr) to act in reply; react: to respond by issuing an invitation
3.  to react favourably: this patient will respond to treatment
4.  an archaic word for correspond
 
n
5.  architect a pilaster or an engaged column that supports an arch or a lintel
6.  Christianity a choral anthem chanted in response to a lesson read at a church service
 
[C14: from Old French respondre, from Latin rēspondēre to return like for like, from re- + spondēre to pledge; see spouse, sponsor]
 
re'spondence
 
n
 
re'spondency
 
n
 
re'sponder
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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