A tenday was a measure of time, ten days long, which was used primarily by both the Vulcan and Romulan civilizations. (TOS novels: The Romulan Way, Spock's World, Honor Blade, The Empty Chair) It was also adopted, to a limited degree, by other Federation cultures. (TOS novel: Prime Directive)

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.