Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
Logic and Definition was a piece of literature from the Vulcan civilization.
It was written by the philosopher Lyras and was required reading for Vulcans of the age of twenty-five to twenty-nine. (TOS novels: Dreadnought!, Battlestations!)