The Collaborative International Dictionary of English v.0.48:

Glebe \Glebe\, n. [F. gl[`e]be, L. gleba, glaeba, clod, land,
   soil.]
   1. A lump; a clod.
      [1913 Webster]

   2. Turf; soil; ground; sod.
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            Fertile of corn the glebe, of oil, and wine.
                                                  --Milton.
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   3. (Eccl. Law) The land belonging, or yielding revenue, to a
      parish church or ecclesiastical benefice.
      [1913 Webster]

WordNet (r) 3.0 (2006):

glebe
    n 1: plot of land belonging to an English parish church or an
         ecclesiastical office

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

GLEBE, eccl. law. The land which belongs to a church. It is the dowry of the
church. Gleba est terra qua consistit dos ecclesiae. Lind. 254; 9 Cranch,
Rep. 329. In the civil law it signified the soil of an inheritance; there
were serfs of the glebe, called gleboe addicti. Code, 11, 47, 7 et 21; Nov.
54, c. 1.