Featured
Games
Cultural
Writing tips
Thesaurus.com
Dictionary.com
Synonyms & Antonyms
e=mc2
NOUN
theory of relativity
Synonyms
STRONGEST
relativity
WEAK
continuum theory
energy-matter relationship
general theory of relativity
principle of equivalence
principle of relativity
special theory of relativity
by dictionary.com
Dictionary.com's Learning Companion
Go beyond just looking up words.
Remember them forever with VocabTrainer.
Start training
