Full Idea
Models are abstract mathematical structures that provide possible interpretations for each of the non-logical primitives in a formal language.
Gist of Idea
Models are mathematical structures which interpret the non-logical primitives
Source
JC Beall / G Restall (Logical Consequence [2005], 3)
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.6