The Collaborative International Dictionary of English v.0.48:

Successor \Suc*ces"sor\, n. [OE. successour, OF. successur,
   successor, F. successeur, L. successor. See Succeed.]
   One who succeeds or follows; one who takes the place which
   another has left, and sustains the like part or character; --
   correlative to predecessor; as, the successor of a deceased
   king. --Chaucer.
   [1913 Webster]

         A gift to a corporation, either of lands or of
         chattels, without naming their successors, vests an
         absolute property in them so lond as the corporation
         subsists.                                --Blackstone.
   [1913 Webster]

WordNet (r) 3.0 (2006):

successor
    n 1: a person who follows next in order; "he was President
         Lincoln's successor" [syn: successor, replacement]
    2: a thing or person that immediately replaces something or
       someone
    3: a person who inherits some title or office [syn: successor,
       heir]

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "successor":
   adherent, aftermath, apparent heir, appendage, attendant,
   backup man, beneficiary heir, buff, cavaliere servente, conclusion,
   consequence, coparcener, courtier, dangler, dependent, descendant,
   disciple, dynasty, effect, fan, fideicommissary heir,
   fiduciary heir, flunky, follower, following, hanger-on, heir,
   heir apparent, heir expectant, heir general, heir in tail,
   heir of entail, heir of inventory, heir of line, heir portioner,
   heir presumptive, heir whatsoever, heiress, henchman, heritor,
   homme de cour, inheritor, inheritress, inheritrix, joint heir,
   line, lineage, next in line, offspring, orphan, parasite, partisan,
   posterity, presumptive heir, public, pursuer, pursuivant, relict,
   remainderman, replacement, reversioner, satellite, sectary, sequel,
   shadow, stooge, supporter, survivor, tagtail, tail, trainbearer,
   votary, ward heeler, widow, widower



The Free On-line Dictionary of Computing (30 December 2018):

daughter
child
successor

    (Or "child", "successor") In a tree, a
   node pointed to by a parent, i.e. another node closer to
   the root node.

   (1998-11-14)


The Free On-line Dictionary of Computing (30 December 2018):

SuccessoR

   A language for distributed computing derived from SR.

   ["SuccessoR: Refinements to SR", R.A. Olsson et al, TR 84-3, U
   Arizona 1984].

   (1994-12-15)


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

SUCCESSOR. One who follows or comes into the place of another.
     2. This term is applied more particularly to a sole corporation, or to
any corporation. The word heir is more correctly applicable to a common
person who takes an estate by descent. 12 Pick. R. 322; Co. Litt. 8 b.
     3. It is also used to designate a person who has been appointed or
elected to some office, after another person.