troth

troth
    n 1: a mutual promise to marry [syn: {betrothal}, {troth},
         {engagement}]
    2: a solemn pledge of fidelity [syn: {plight}, {troth}]
    

Troth \Troth\, n. [A variant of truth. See {Truth}.]
   1. Belief; faith; fidelity.
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            Bid her alight
            And hertroth plight.                  --Shak.
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   2. Truth; verity; veracity; as, by my troth. --Shak.
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            In troth, thou art able to instruct gray hairs.
                                                  --Addison.
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   3. Betrothal.
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62 Moby Thesaurus words for "troth":
      adherence, adhesion, affiance, allegiance, assurance, assure,
      attachment, avouch, avouchment, banns, banns of matrimony,
      become engaged, betroth, betrothal, betrothing, betrothment,
      bona fides, bond, bonne foi, constancy, contract,
      contract an engagement, countersign, devotedness, devotion, engage,
      engagement, espousal, faith, faithfulness, fealty, fidelity,
      firmness, good faith, guarantee, handfasting, homage, loyalty,
      make a promise, marriage contract, oath, parole, pledge, plight,
      plighted faith, plighted troth, promise, publish the banns,
      solemn declaration, staunchness, steadfastness, swear, tie,
      true blue, trueness, underwrite, vouch, vow, warrant, warranty,
      word, word of honor