# rotation

Pronunciation: say "roh-TAY-shuhn" US /ɹoʊˈteɪʃən/, UK /ɹəʊˈteɪʃən/

## Noun

1. The act or motion of spinning or turning about a center or an axis, as a wheel or planet does.
   - Simple: The turning of something around a center point or a line through it.
   - _The rotation of the planet on its axis takes about twenty-four hours._
   - _Friction gradually slowed the rotation of the spinning top._
2. A single complete turn around a center point or an axis.
   - Simple: One full turn all the way around a center or an axis.
   - _Each rotation of the Earth marks one full day._
   - _The motor's shaft makes thousands of rotations per minute._
3. A regular cycle in which people take turns at a task or items are used in order to even out wear; also a duty roster.
   - Simple: A regular order in which people take turns at a job, or things are used in turn.
   - _Crop rotation keeps the soil healthy by changing what is planted each season._
   - _The team posted the new rotation showing who covers each weekend._
4. The repeated playing of a song or advertisement on a radio station or television channel over a period of time.
   - Simple: The repeated playing of songs or ads on a radio or TV channel.
   - _The station added the band's latest track to its daily rotation._
   - _Once a hit drops out of rotation, listeners rarely hear it again._
5. In baseball, the set of starting pitchers a team cycles through over successive games.
   - Simple: In baseball, the group of starting pitchers a team uses in turn.
   - _The manager slotted the veteran into the back of the rotation._
   - _A five-man rotation gives each starter four days of rest._
6. A transformation that turns a figure around a fixed point while preserving all distances between points.
   - Simple: A turn that moves every point around a fixed center while keeping all distances the same.
   - _A rotation about the origin maps each point to a new position the same distance away._
   - _Combining a rotation with a reflection produces another rigid motion of the plane._
7. The movement of investment money between sectors of the economy or styles of investing, based on expected shifts in the market cycle.
   - Simple: Moving money from one part of the market to another, based on what investors expect to happen next.
   - _Analysts noted a rotation from growth stocks into value names as rates rose._
   - _A defensive rotation into utilities often signals worry about a slowdown._
8. The point during the takeoff roll when the pilot raises the aircraft's nose wheel off the ground.
   - Simple: The moment during takeoff when the pilot pulls the plane's nose up off the runway.
   - _The first officer called out the speed for rotation as the jet gathered pace._
   - _A premature rotation can cause the tail to strike the runway._

## Origin

Borrowed from Latin rotatiō; by surface analysis, it is rotate plus the suffix -ion.

Source: DictionaryAI, https://dictionaryai.com/define/rotation (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).