1 Something that is seen as comparable to another; specifically, a physical representation, such as a pointer on a dial, of a quantity being measured; an organ or body part resembling another; an organic compound related to another by the replacement of hydrogen atoms by alkyl groups. adj. n.
2 (Of or pertaining to) a form of knowledge representation in which continuously varying dimensions or relations between elements of the thing being represented correspond to continuously varying dimensions or relations between parts of the representation, so that the representations resemble the things that they represent. Also spelt analog, especially in the US, where it is a variant form, and in computing terminology. Compare digital, symbolic representation. analogical or analogic adj. [From Greek analogos proportionate, from ana up + logos word, discourse, or reason]