12 entries under theory topic. ×

6
time machine(expression, concept, time, travel)
5
forward time travel(expression, concept, time, travel)
4
backward time travel(expression, concept, time, travel)
4
closed time-like curve(expression, time, loop)
4
time machine research(expression, time, machine)
4
time travel concept(expression, study, thought)
3
time travel theory(expression, study, thought)
2
one-way time travel(expression, concept, time, travel)
2
time travel assumption(expression, study, thought)
2
time travel hypothesis(expression, study, thought)
2
time travel idea(expression, study, thought)
2
time travel research(expression, time, research)
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APASmart Define. (-0001). time travel thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/time_travel/thesaurus/narrower
ChicagoSmart Define. -0001. "time travel thesaurus" https://smartdefine.org/time_travel/thesaurus/narrower (accessed September 30, 2026).
HarvardSmart Define -0001, time travel thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/time_travel/thesaurus/narrower>.
MLASmart Define. "time travel thesaurus" 30 November -0001. Web. 30 September 2026. <https://smartdefine.org/time_travel/thesaurus/narrower>