grav·i·ta·tion
noun/ˌɡrævɪˈteɪʃn/
/ˌɡrævɪˈteɪʃn/
[uncountable] (physics)- a force of attraction that causes objects to move towards each other
引力 Word Originmid 17th cent.: from modern Latin gravitatio(n-), from the verb gravitare, from Latin gravitas ‘weight’.