(Translated by https://www.hiragana.jp/)
The Wayback Machine - https://web.archive.org/web/20140120141608/http://www.merriam-webster.com/dictionary/detection
2 ENTRIES FOUND:
  1. detection
  2. double detection

de·tec·tion

noun \di-ˈtek-shən\

: the act or process of discovering, finding, or noticing something

Full Definition of DETECTION

1
:  the act of detecting :  the state or fact of being detected
2
:  the process of demodulating