An Etymological Dictionary of Astronomy and Astrophysics

1. (n.) Something that has → analogy to something else.
   

2. Chemistry: (n.) A chemical compound whose molecular structure is closely similar to that of another.
   

3. Relating to or using signals or information represented by a continuous variable physical quantity such as spatial position or voltage. Often contrasted with → digital.

See also: From Fr. analogue, from Gk. analogon, → analogy.