reaction time

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. The interval of time between application of a stimulus and detection of a response.

from Wiktionary, Creative Commons Attribution/Share-Alike License

• n. The interval between the reception of a stimulus and the initiation of a response

from the GNU version of the Collaborative International Dictionary of English

• n. in nerve physiology, the interval between the application of a stimulus to an end organ of sense and the reaction or resulting movement; -- called also physiological time.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. the time that elapses between a stimulus and the response to it