1. [n]  an inhibition or ban resulting from social custom or emotional aversion
2. [n]  a prejudice (especially in Polynesia and other South Pacific islands) that prohibits the use or mention of something because of its sacred nature
3. [adj]  excluded from use or mention; "forbidden fruit"; "in our house dancing and playing cards were out"; "a taboo subject"
4. [adj]  forbidden to profane use especially in South Pacific islands
5. [v]  declare as sacred and forbidden

Taboo
Trapped in a marriage filled with hatred to a man who destroyed her people, Countess Teo Korsakova is taken captive by General Andre Duras, and she finally falls in love as she finds forbidden passion in the arms of the enemy. Original.

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1. \Ta*boo"\, a. [Written also {tapu}.] [Polynesian tabu,
   tapu, sacred, under restriction, a prohibition.]
   Set apart or sacred by religious custom among certain races
   of Polynesia, New Zealand, etc., and forbidden to certain
   persons or uses; hence, prohibited under severe penalties;
   interdicted; as, food, places, words, customs, etc., may be
   taboo.
   

2. \Ta*boo"\, n.
   A total prohibition of intercourse with, use of, or approach
   to, a given person or thing under pain of death, -- an
   interdict of religious origin and authority, formerly common
   in the islands of Polynesia; interdiction. [Written also
   {tabu}.]
   

3. \Ta*boo"\, v. t. [imp. & p. p. {Tabooed}; p. pr. & vb. n.
   {Tabooing}.]
   To put under taboo; to forbid, or to forbid the use of; to
   interdict approach to, or use of; as, to taboo the ground set
   apart as a sanctuary for criminals. [Written also {tabu}.]