All 3 Uses

rigorous
in
A Prayer for Owen Meany
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Nevertheless, in my grandmother's view, it required nearly constant effort to keep track of the world—both our own world and the world outside the sphere of Gravesend—and it required effort and intelligence to make nearly constant comment on one's observations; in these efforts, Grandmother was rigorous and unswerving.†
p. 260.3 *
Everyone suspected that the rigors of a good school would have the desired, dulling effect on Noah and Simon—Gravesend Academy would assault them with a host of new demands, of impossible standards.†
p. 268.8
We had suffered the academic rigors of Gravesend Academy; the course work at the University of New Hampshire was very easy in comparison.†
p. 439.2 *

Definitions:

(1) (rigorous as in: we follow a rigorous procedure)
thorough and careful procedures
(2) (rigorous as in: a rigorous math class)
difficult and demanding
(3) (rigorous as in: rigorous enforcement)
strict when enforcing rules
(4) (meaning too rare to warrant focus)