\A*nal"o*gy\, n.; pl. {Analogies}. [L. analogia, Gr. ?,
fr. ?: cf. F. analogie. See {Analogous}.]
1. A resemblance of relations; an agreement or likeness
   between things in some circumstances or effects, when the
   things are otherwise entirely different. Thus, learning
   enlightens the mind, because it is to the mind what light
   is to the eye, enabling it to discover things before
   hidden.
Note: Followed by between, to, or with; as, there is an
      analogy between these objects, or one thing has an
      analogy to or with another.
Note: Analogy is very commonly used to denote similarity or
      essential resemblance; but its specific meaning is a
      similarity of relations, and in this consists the
      difference between the argument from example and that
      from analogy. In the former, we argue from the mere
      similarity of two things; in the latter, from the
      similarity of their relations. --Karslake.
2. (Biol.) A relation or correspondence in function, between
   organs or parts which are decidedly different.
3. (Geom.) Proportion; equality of ratios.
4. (Gram.) Conformity of words to the genius, structure, or
   general rules of a language; similarity of origin,
   inflection, or principle of pronunciation, and the like,
   as opposed to {anomaly}. --Johnson.