The Collaborative International Dictionary of English v.0.48:

Deacon \Dea"con\ (d[=e]"k'n), v. t.
   1. To read aloud each line of (a psalm or hymn) before
      singing it, -- usually with off. [Colloq. New. Eng.] See
      Line, v. t.
      [1913 Webster]

   Note: The expression is derived from a former custom in the
         Congregational churches of New England. It was part of
         the office of a deacon to read aloud the psalm given
         out, one line at a time, the congregation singing each
         line as soon as read; -- called, also, lining out the
         psalm.
         [1913 Webster]

   2. With humorous reference to hypocritical posing: To pack
      (fruit or vegetables) with the finest specimens on top; to
      alter slyly the boundaries of (land); to adulterate or
      doctor (an article to be sold), etc. [Colloq., U. S.]
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Deacon \Dea"con\ (d[=e]"k'n), n. [OE. diakne, deakne, deken, AS.
   diacon, deacon, L. diaconus, fr. Gr. dia`konos a servant or
   minister, a minister of the church; of uncertain origin. In
   sense 2 prob. confused with dean.]
   1. (Eccl.) An officer in Christian churches appointed to
      perform certain subordinate duties varying in different
      communions. In the Roman Catholic and Episcopal churches,
      a person admitted to the lowest order in the ministry,
      subordinate to the bishops and priests. In Presbyterian
      churches, he is subordinate to the minister and elders,
      and has charge of certain duties connected with the
      communion service and the care of the poor. In
      Congregational churches, he is subordinate to the pastor,
      and has duties as in the Presbyterian church.
      [1913 Webster]

   2. The chairman of an incorporated company. [Scot.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

deacon
    n 1: a Protestant layman who assists the minister [syn:
         deacon, Protestant deacon]
    2: a cleric ranking just below a priest in Christian churches;
       one of the Holy Orders

The Free On-line Dictionary of Computing (19 January 2023):

DEACON

   Direct English Access and CONtrol.  English-like query system.
   Sammet 1969, p.668.