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измена n stresses
gen.	unfaithfulness; apostasy; betrayal; sell-out; recreance; traitorousness; treacherousness; treasonableness; adultery; infidelity; Punic faith; a piece an act of perfidy; bad faith; sell out; breach of faith; recreancy; traitory (Mira_G); faithlessness; perfidy; treachery; treason; indiscretions (супружеская; эвфемизм: The Princess of Wales, who normally overlooked her husband's indiscretions... Taras); falsehood; falseness; falsity; a foul play; insidiousness; perfidiousness
amer.	bolt (убеждениям, партии и т.п.)
arch.	untruth
book.	apostasy (делу, партии и т.п.)
dipl.	act of perfidy
law	treason (государственная); treasonable conduct (государственная)
Makarov.	an act of perfidy
obs.	guilefulness; perduelism; prodition
scottish	perduellion
slang	freakout (в знач. "на измене" Халеев)
измены n
inf.	playing around ("I wasn't faithful to Jenny: she knew this yet she stayed with me. Funnily enough, it was only when I stopped all the playing around that she left me.." (Michael Winner) – когда я перестал ей изменять ART Vancouver)

измена: 146 phrases in 22 subjects

Black slang / African-American Vernacular	1
Business	1
Civil law	1
Criminal law	4
Diplomacy	3
Drug-related slang	2
Euphemistic	1
French	2
General	40
Historical	1
Humorous / Jocular	1
Informal	4
Latin	1
Law	33
Makarov	23
Mass media	1
Notarial practice	2
Politics	4
Russian language	1
Security systems	3
Slang	12
Vulgar	5