The Collaborative International Dictionary
Retection
Retection \Re*tec"tion\, n. [L. retegere, retectum, to uncover;
pref. re- + tegere to cover.]
Act of disclosing or uncovering something concealed. [Obs.]
--Boyle.
Wiktionary
retection
Etymology 1 n. (context obsolete English) disclosure or detection of something concealed. Etymology 2
n. (context engineering English) detection through a concealing layer. (Note: this use is somewhat specific to electrical engineering and related fields investigating the uses of T-Ray Sensing.)