being of crucial importance; "a pivotal event"; "Its pivotal location has also exposed it to periodic invasions"- Henry Kissinger; "the polar events of this study"; "a polar principal"
the act of rotating as if on an axis; "the rotation of the dancer kept time with the music"
a planned recurrent sequence (of crops or personnel etc.); "crop rotation makes a balanced demand on the fertility of the soil"; "the manager had only four starting pitchers in his rotation"
a single complete turn (axial or orbital); "the plane made three rotations before it crashed"; "the revolution of the earth about the sun takes one year"
(mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin
(mathematics) the sum of a finite or infinite sequence of expressions
a periodical that appears at scheduled times
(sports) several contests played successively by the same teams; "the visiting team swept the series"
similar things placed in order or happening one after another; "they were investigating a series of bank robberies"
a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection; "the Post Office issued a series commemorating famous American entertainers"; "his coin collection included the complete series of Indian-head pennies"
(electronics) connection of components in such a manner that current flows first through one and then through the other; "the voltage divider consisted of a series of fixed resistors"