rotation

sự quay, sự xoay, vòng quay

1. The act of turning around a centre or an axis.Sự quay quanh một tâm hoặc một trục.
2. A single complete cycle around a centre or an axis.Một vòng hoàn chỉnh quanh một tâm hoặc một trục.
3. A regular variation in a sequence, such as to even out wear, or people taking turns in a task; a duty roster.
4. Тhe movement of investments between different sectors of an economy, or styles of investing, based on anticipated changes in the economic or market cycle.
5. An operation on a metric space that is a continuous isometry and fixes at least one point.

• The earth's rotation about its axis is responsible for its being slightly oblate rather than a sphere.
• Earth's moon completes a rotation every twenty-seven days or so.
• Applying crop rotation to a field avoids depleting soil nutrients the way repeated use of a single crop might do.