ro·ta·tion 
/roʊˈteɪʃən/ noun
plural ro·ta·tions /roʊˈteɪʃən/ noun 1 a [noncount] : the act or process of moving or turning around a central point
▪ the rotation of the Earth around its axis ▪ the rotation of the Moon around the Earth
b [count] : a complete turn around a central point
▪ The Earth makes one rotation every day. 2 a [noncount] : the act of regularly changing something by replacing it with something else
▪ crop rotation ▪ Alfalfa and corn are planted in rotation.
b : the act of regularly changing the place or position of things or people so that each takes the place of another [noncount] ▪ the rotation of the job of club president [count] ▪ The car needs a tire rotation. 3 [count] US : the group of people who take turns doing something
▪ Where are we in the rotation? [=when is it our turn?] ▪ (baseball) The team has a good (starting) rotation. [=group of pitchers who start games]
▪ the rotation of the Earth around its axis ▪ the rotation of the Moon around the Earth
b [count] : a complete turn around a central point
▪ The Earth makes one rotation every day.
▪ crop rotation ▪ Alfalfa and corn are planted in rotation.
b : the act of regularly changing the place or position of things or people so that each takes the place of another [noncount] ▪ the rotation of the job of club president [count] ▪ The car needs a tire rotation.
▪ Where are we in the rotation? [=when is it our turn?] ▪ (baseball) The team has a good (starting) rotation. [=group of pitchers who start games]
— ro·ta·tion·al /roʊˈteɪʃənl̟/ adjective always used before a noun technical
▪ the rotational axis ▪ rotational motion
/roʊˈteɪʃənl̟/ adjective always used before a noun technical ▪ the rotational axis ▪ rotational motion
