Real Dictionary

pivot
A pivot is the pin or the central point on which something balances or turns.
countable noun: The pivot in a situation is the most important thing which everything else is based on or arranged around.
verb: If someone or something pivots, they change direction.
verb: If something pivots, it balances or turns on a central point.

pivot in American English
a point, shaft, pin, etc. on which something turns
pivotal
to provide with, attach by, or mount on a pivot or pivots
to turn on or as if on a pivot
intransitive verb: to turn on or as on a pivot
noun: a pin, point, or short shaft on the end of which something rests and turns, or upon and about which something rotates or oscillates
transitive verb: to mount on, attach by, or provide with a pivot or pivots

pivot in British English
noun: a short shaft or pin supporting something that turns; fulcrum
verb: to mount on or provide with a pivot or pivots

pivot in Mechanical Engineering
noun: A pivot is a short shaft or pin supporting something that turns.