The Collaborative International Dictionary of English v.0.48:

Bless \Bless\, v. t. [imp. & p. p. Blessedor Blest; p. pr. &
   vb. n. Blessing.] [OE. blessien, bletsen, AS. bletsian,
   bledsian, bloedsian, fr. bl?d blood; prob. originally to
   consecrate by sprinkling with blood. See Blood.]
   1. To make or pronounce holy; to consecrate
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            And God blessed the seventh day, and sanctified it.
                                                  --Gen. ii. 3.
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   2. To make happy, blithesome, or joyous; to confer prosperity
      or happiness upon; to grant divine favor to.
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            The quality of mercy is . . . twice blest;
            It blesseth him that gives and him that takes.
                                                  --Shak.
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            It hath pleased thee to bless the house of thy
            servant, that it may continue forever before thee.
                                                  --1 Chron.
                                                  xvii. 27 (R.
                                                  V. )
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   3. To express a wish or prayer for the happiness of; to
      invoke a blessing upon; -- applied to persons.
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            Bless them which persecute you.       --Rom. xii.
                                                  14.
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   4. To invoke or confer beneficial attributes or qualities
      upon; to invoke or confer a blessing on, -- as on food.
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            Then he took the five loaves and the two fishes, and
            looking up to heaven, he blessed them. --Luke ix.
                                                  16.
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   5. To make the sign of the cross upon; to cross (one's self).
      [Archaic] --Holinshed.
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   6. To guard; to keep; to protect. [Obs.]
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   7. To praise, or glorify; to extol for excellences.
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            Bless the Lord, O my soul: and all that is within
            me, bless his holy name.              --Ps. ciii. 1.
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   8. To esteem or account happy; to felicitate.
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            The nations shall bless themselves in him. --Jer.
                                                  iv. 3.
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   9. To wave; to brandish. [Obs.]
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            And burning blades about their heads do bless.
                                                  --Spenser.
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            Round his armed head his trenchant blade he blest.
                                                  --Fairfax.
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   Note: This is an old sense of the word, supposed by Johnson,
         Nares, and others, to have been derived from the old
         rite of blessing a field by directing the hands to all
         parts of it. "In drawing [their bow] some fetch such a
         compass as though they would turn about and bless all
         the field." --Ascham.
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   Bless me! Bless us! an exclamation of surprise. --Milton.

   To bless from, to secure, defend, or preserve from. "Bless
      me from marrying a usurer." --Shak.
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            To bless the doors from nightly harm. --Milton.
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   To bless with, To be blessed with, to favor or endow
      with; to be favored or endowed with; as, God blesses us
      with health; we are blessed with happiness.
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The Collaborative International Dictionary of English v.0.48:

Blessed \Bless"ed\ (bl[e^]s"[e^]d), a.
   1. Hallowed; consecrated; worthy of blessing or adoration;
      heavenly; holy.
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            O, run; prevent them with thy humble ode,
            And lay it lowly at his blessed feet. --Milton.
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   2. Enjoying happiness or bliss; favored with blessings;
      happy; highly favored.
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            All generations shall call me blessed. --Luke i. 48.
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            Towards England's blessed shore.      --Shak.
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   3. Imparting happiness or bliss; fraught with happiness;
      blissful; joyful. "Then was a blessed time." "So blessed a
      disposition." --Shak.
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   4. Enjoying, or pertaining to, spiritual happiness, or
      heavenly felicity; as, the blessed in heaven.
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            Reverenced like a blessed saint.      --Shak.
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            Cast out from God and blessed vision. --Milton.
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   5. (R. C. Ch.) Beatified.
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   6. Used euphemistically, ironically, or intensively.
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            Not a blessed man came to set her [a boat] free.
                                                  --R. D.
                                                  Blackmore.
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WordNet (r) 3.0 (2006):

blessed
    adj 1: highly favored or fortunate (as e.g. by divine grace);
           "our blessed land"; "the blessed assurance of a steady
           income" [syn: blessed, blest] [ant: cursed,
           curst]
    2: worthy of worship; "the Blessed Trinity"
    3: expletives used informally as intensifiers; "he's a blasted
       idiot"; "it's a blamed shame"; "a blame cold winter"; "not a
       blessed dime"; "I'll be damned (or blessed or darned or
       goddamned) if I'll do any such thing"; "he's a damn (or
       goddam or goddamned) fool"; "a deuced idiot"; "an infernal
       nuisance" [syn: blasted, blame, blamed, blessed,
       damn, damned, darned, deuced, goddam, goddamn,
       goddamned, infernal]
    4: Roman Catholic; proclaimed one of the blessed and thus worthy
       of veneration [syn: beatified, blessed]
    5: enjoying the bliss of heaven
    6: characterized by happiness and good fortune; "a blessed time"