The Collaborative International Dictionary of English v.0.48:

-graph \-graph\ (-gr[.a]f) [From Gr. gra`fein to write. See
   Graphic.]
   A suffix signifying something written (as in digraph), a
   writing; also, a writer or an instrument that produces a
   written or visible record of a measurement, such as a
   spectrograph; as, autograph, crystograph, telegraph,
   photograph.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Graph \Graph\ (gr[.a]f), n. [See -graph.] (Math.)
   1. A curve or surface, the locus of a point whose coordinates
      are the variables in the equation of the locus; as, a
      graph of the exponential function.
      [Webster 1913 Suppl.]

   2. A diagram symbolizing a system of interrelations of
      variable quantities using points represented by spots, or
      by lines to represent the relations of continuous
      variables. More than one set of interrelations may be
      presented on one graph, in which case the spots or lines
      are typically distinguishable from each other, as by
      color, shape, thickness, continuity, etc. A diagram in
      which relationships between variables are represented by
      other visual means is sometimes called a graph, as in a
      bar graph, but may also be called a chart.
      [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

graph
    n 1: a visual representation of the relations between certain
         quantities plotted with reference to a set of axes [syn:
         graph, graphical record]
    v 1: represent by means of a graph; "chart the data" [syn:
         graph, chart]
    2: plot upon a graph

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "graph":
   alphabetic character, black and white, blueprint, brouillon,
   cartoon, catalog, catalogue raisonne, character, charcoal,
   charcoal drawing, chart, chiaroscuro, cipher, copy, crayon,
   delineation, design, device, diagram, doodle, draft, drawing,
   ebauche, elevation, esquisse, figure, grapheme, ground plan,
   house plan, ichnography, lay off, lay out, letter,
   lexigraphic character, line drawing, map, map out, mark off,
   mark out, monogram, outline, pastel, pattern, pen-and-ink,
   pencil drawing, phonetic character, phonetic symbol,
   pictographic character, plan, plot, plot out, profile, projection,
   rough, rough copy, rough draft, rough outline, schema, scheme,
   set out, sign, silhouette, silver-print drawing, sinopia, skeleton,
   sketch, sketch out, study, syllabic, symbol, table,
   table of contents, tracing, vignette, working drawing, writing,
   written character



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

graph

   1.  A collection of nodes and edges.

   See also connected graph, degree, directed graph, Moore
   bound, regular graph, tree.

   2.  A visual representation of algebraic equations
   or data.

   (1996-09-22)