theory of relativity theory of relativity /ˈθɪəri ɒv ˌrɛləˈtɪvɪti/

noun

1. (physics) the theory that space and time are relative concepts rather than absolute concepts  ( Einstein's theory of relativity , relativity , relativity theory , theory of relativity )
   (physics) the theory that space and time are relative concepts rather than absolute concepts
   
   

 lopper lopper /ˈlɑːpər/

noun

1. A long-handled pruning saw with a curved blade at the end and sometimes a clipper; used to prune small trees  ( lopper , pruner , pruning hook )
   a long-handled pruning saw with a curved blade at the end and sometimes a clipper; used to prune small trees
   
   

 potable potable /ˈpoʊtəbəl/

adjective

1. Suitable for drinking  ( drinkable , potable )
   suitable for drinking
   

noun

1. Any liquid suitable for drinking  ( drinkable , potable , beverage , drink )
   any liquid suitable for drinking
    May I take your beverage order?
   may I take your beverage order?
   
   

 foreword foreword /ˈfɔrˌwɝːd/

noun

1. A short introductory essay preceding the text of a book  ( foreword , prolusion , preface )
   a short introductory essay preceding the text of a book