The Collaborative International Dictionary of English v.0.48:

Relative \Rel"a*tive\ (r?l"?-t?v), a. [F. relatif, L. relativus.
   See Relate.]
   1. Having relation or reference; referring; respecting;
      standing in connection; pertaining; as, arguments not
      relative to the subject.
      [1913 Webster]

            I'll have grounds
            More relative than this.              --Shak.
      [1913 Webster]

   2. Arising from relation; resulting from connection with, or
      reference to, something else; not absolute.
      [1913 Webster]

            Every thing sustains both an absolute and a relative
            capacity: an absolute, as it is such a thing, endued
            with such a nature; and a relative, as it is a part
            of the universe, and so stands in such a relations
            to the whole.                         --South.
      [1913 Webster]

   3. (Gram.) Indicating or expressing relation; refering to an
      antecedent; as, a relative pronoun.
      [1913 Webster]

   4. (Mus.) Characterizing or pertaining to chords and keys,
      which, by reason of the identify of some of their tones,
      admit of a natural transition from one to the other.
      --Moore (Encyc. of Music).
      [1913 Webster]

   Relative clause (Gram.), a clause introduced by a relative
      pronoun.

   Relative term, a term which implies relation to, as
      guardian to ward, matter to servant, husband to wife. Cf.
      Correlative.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Relative \Rel"a*tive\, n.
   One who, or that which, relates to, or is considered in its
   relation to, something else; a relative object or term; one
   of two object or term; one of two objects directly connected
   by any relation. Specifically:
   (a) A person connected by blood or affinity; strictly, one
       allied by blood; a relation; a kinsman or kinswoman.
       "Confining our care . . . to ourselves and relatives."
       --Bp. Fell.
   (b) (Gram.) A relative pronoun; a word which relates to, or
       represents, another word or phrase, called its
       antecedent; as, the relatives "who", "which", "that".
       [1913 Webster]

WordNet (r) 3.0 (2006):

relative
    adj 1: estimated by comparison; not absolute or complete; "a
           relative stranger" [syn: relative, comparative] [ant:
           absolute]
    2: properly related in size or degree or other measurable
       characteristics; usually followed by `to'; "the punishment
       ought to be proportional to the crime"; "earnings relative to
       production" [syn: proportional, relative]
    n 1: a person related by blood or marriage; "police are
         searching for relatives of the deceased"; "he has distant
         relations back in New Jersey" [syn: relative, relation]
    2: an animal or plant that bears a relationship to another (as
       related by common descent or by membership in the same genus)
       [syn: relative, congener, congenator, congeneric]

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

RELATIVE

   Early system on IBM 650.  Listed in CACM 2(5):16 (May 1959).