paradigm

`An example or pattern of the inflexion of a noun, verb, or other inflected part of speech.'

`A pattern, exemplar, example.'

praxis

1. Action, practice; specially
   • The practice or exercise of a technical subject or art, as distinct from the theory of it
   • Habitual action, accepted practice, custom.
2. Action that is entailed by theory or a function that results from a particular structure.
   • An example or collection of examples to serve for practice or exercise in a subject, especially in grammar.
   • A means or instrument of practice or exercise in a subject; a practical specimen or model.

rubric

`A descriptive heading or title; a designation, category. Also, an injunction, a general rule.'

`A direction for the conduct of divine service inserted in liturgical books, and properly written or printed in red.'

teleology

`explanation of phenomena by the purposes they serve rather than by postulated causes' (Oxford Encyclopedic English Dictionary, 1991)

model

ideal

exemplar

Sources

All quotes here come from the online OED except where noted.