relativity
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
Einstein's theory describing how measurements of space, time and motion depend on the observer's frame of reference.
Usage notes
"Special relativity" deals with constant speeds, while "general relativity" extends the theory to gravity and acceleration.
Test yourself
Which word fits the gap? "According to _____, a clock moving very fast ticks more slowly than one standing still."
Answer: relativity
In your own words, what does "relativity" mean?
Einstein's theory describing how measurements of space, time and motion depend on the observer's frame of reference.
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