The Collaborative International Dictionary of English v.0.48:

Offer \Of"fer\, v. t. [imp. & p. p. Offered; p. pr. & vb. n.
   Offering.] [OE. offren, AS. offrian to sacrifice, fr. L.
   offerre; ob (see OB-) + ferre to bear, bring. The English
   word was influenced by F. offrir to offer, of the same
   origin. See 1st Bear.]
   1. To present, as an act of worship; to immolate; to
      sacrifice; to present in prayer or devotion; -- often with
      up.
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            Thou shalt offer every day a bullock for a sin
            offering for atonement.               --Ex. xxix.
                                                  36.
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            A holy priesthood to offer up spiritual sacrifices.
                                                  --1 Pet. ii.
                                                  5.
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   2. To bring to or before; to hold out to; to present for
      acceptance or rejection; as, to offer a present, or a
      bribe; to offer one's self in marriage.
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            I offer thee three things.            --2 Sam. xxiv.
                                                  12.
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   3. To present in words; to proffer; to make a proposal of; to
      suggest; as, to offer an opinion. With the infinitive as
      an objective: To make an offer; to declare one's
      willingness; as, he offered to help me.
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   4. To attempt; to undertake.
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            All that offer to defend him.         --Shak.
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   5. To bid, as a price, reward, or wages; as, to offer a
      guinea for a ring; to offer a salary or reward.
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   6. To put in opposition to; to manifest in an offensive way;
      to threaten; as, to offer violence, attack, etc.
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   Syn: To propose; propound; move; proffer; tender; sacrifice;
        immolate.
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Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "offered":
   arbitrary, autonomous, discretional, discretionary, elective, free,
   free will, gratuitous, independent, nonmandatory, optional,
   proffered, self-acting, self-active, self-determined,
   self-determining, spontaneous, unasked, unbesought, unbidden,
   uncalled-for, uncoerced, uncompelled, unforced, uninfluenced,
   uninvited, unpressured, unprompted, unrequested, unrequired,
   unsolicited, unsought, voluntary, volunteer, willful