The Collaborative International Dictionary of English v.0.48:

Lord \Lord\, n. [OE. lord, laverd, loverd, AS. hl[=a]ford, for
   hl[=a]fweard, i. e., bread keeper; hl[=a]f bread, loaf +
   weardian to look after, to take care of, to ward. See Loaf,
   and Ward to guard, and cf. Laird, Lady.]
   1. One who has power and authority; a master; a ruler; a
      governor; a prince; a proprietor, as of a manor.
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            But now I was the lord
            Of this fair mansion.                 --Shak.
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            Man over men
            He made not lord.                     --Milton.
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   2. A titled nobleman., whether a peer of the realm or not; a
      bishop, as a member of the House of Lords; by courtesy;
      the son of a duke or marquis, or the eldest son of an
      earl; in a restricted sense, a baron, as opposed to
      noblemen of higher rank. [Eng.]
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   3. A title bestowed on the persons above named; and also, for
      honor, on certain official persons; as, lord advocate,
      lord chamberlain, lord chancellor, lord chief justice,
      etc. [Eng.]
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   4. A husband. "My lord being old also." --Gen. xviii. 12.
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            Thou worthy lord
            Of that unworthy wife that greeteth thee. --Shak.
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   5. (Feudal Law) One of whom a fee or estate is held; the male
      owner of feudal land; as, the lord of the soil; the lord
      of the manor.
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   6. The Supreme Being; Jehovah.
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   Note: When Lord, in the Old Testament, is printed in small
         capitals, it is usually equivalent to Jehovah, and
         might, with more propriety, be so rendered.
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   7. (Christianity) The Savior; Jesus Christ.
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   House of Lords, one of the constituent parts of the British
      Parliament, consisting of the lords spiritual and
      temporal.

   Lord high chancellor, Lord high constable, etc. See
      Chancellor, Constable, etc.

   Lord justice clerk, the second in rank of the two highest
      judges of the Supreme Court of Scotland.

   Lord justice general, or Lord president, the highest in
      rank of the judges of the Supreme Court of Scotland.

   Lord keeper, an ancient officer of the English crown, who
      had the custody of the king's great seal, with authority
      to affix it to public documents. The office is now merged
      in that of the chancellor.

   Lord lieutenant, a representative of British royalty: the
      lord lieutenant of Ireland being the representative of
      royalty there, and exercising supreme administrative
      authority; the lord lieutenant of a county being a
      deputy to manage its military concerns, and also to
      nominate to the chancellor the justices of the peace for
      that county.

   Lord of misrule, the master of the revels at Christmas in a
      nobleman's or other great house. --Eng. Cyc.

   Lords spiritual, the archbishops and bishops who have seats
      in the House of Lords.

   Lords temporal, the peers of England; also, sixteen
      representative peers of Scotland, and twenty-eight
      representatives of the Irish peerage.

   Our lord, Jesus Christ; the Savior.

   The Lord's Day, Sunday; the Christian Sabbath, on which the
      Lord Jesus rose from the dead.

   The Lord's Prayer, (Christianity) the prayer which Jesus
      taught his disciples, also called the Our Father.
      --Matt. vi. 9-13.

   The Lord's Supper.
      (a) The paschal supper partaken of by Jesus the night
          before his crucifixion.
      (b) The sacrament of the eucharist; the holy communion.

   The Lord's Table.
      (a) The altar or table from which the sacrament is
          dispensed.
      (b) The sacrament itself.
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WordNet (r) 3.0 (2006):

House of Lords
    n 1: the upper house of the British parliament [syn: House of
         Lords, British House of Lords]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

HOUSE OF LORDS. Eng. law. The English lords, temporal and spiritual, when
taken collectively and forming a branch of the parliament, are called the
House of Lords.
     2. Its assent is required to all laws. As a court of justice, it tries
all impeachments.