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1.
The systematic use of terror and/or unlawful warfare by one spouse against the other spouse as a means of coercion.
In an effort to compel my recognition of her financial contribution to our family, my wife engaged in "Marital Terrorism" when she opened a saving account in her own name, withdrew large amounts of cash from our joint bank account and deposited into her savings account.
by Papagallo December 13, 2010
 
2.
A act committed by a person, when for personal gain, they knowingly have an affair with a married person regardless of the emotional, physical, or financial devastation caused to the marriage.
Their 20 year marriage was destroyed by marital terrorism.

Cheating websites encourage marital terrorism.

Their entire family was torn apart by a single act of martial terrorism.
by Dreamt Organization - December 04, 2013