Moment of rotation. See Moment of inertia, under Moment.Rotation in office, the practice of changing public officers at frequent intervals by discharges and substitutions.Rotation of crops, the practices of cultivating an orderly succession of different crops on the same land.

(Ro*ta"tion) a. Pertaining to, or resulting from, rotation; of the nature of, or characterized by, rotation; as, rotational velocity.

(Ro"ta*tive) a. [Cf. F. rotatif.] turning, as a wheel; rotary; rotational.

This high rotative velocity of the sun must cause an equatorial rise of the solar atmosphere.

Rotative engine, a steam engine in which the reciprocating motion of the piston is transformed into a continuous rotary motion, as by means of a connecting rod, a working beam and crank, or an oscillating cylinder.

(Ro*ta"tor) n. [L.]

1. (Anat.) that which gives a rotary or rolling motion, as a muscle which partially rotates or turns some part on its axis.

2. (Metal.) A revolving reverberatory furnace.

(||Ro`ta*to"ri*a) n. pl. [NL.] (Zoöl.) Same as Rotifera.

(Ro"ta*to*ry) a. [Cf. F. rotatoire. See Rotate, Rotary.]

1. Turning as on an axis; rotary.

2. Going in a circle; following in rotation or succession; as, rotatory assembles. Burke.

3. (Opt.) Producing rotation of the plane of polarization; as, the rotatory power of bodies on light. See the Note under polarization. Nichol.

(Ro"ta*to*ry), n. (Zoöl.) A rotifer. [R.] Kirby.

(Rotche) n. (Zoöl.) A very small arctic sea bird (Mergulus alle, or Alle alle) common on both coasts of the Atlantic in winter; — called also little auk, dovekie, rotch, rotchie, and sea dove.

1. The act of turning, as a wheel or a solid body on its axis, as distinguished from the progressive motion of a revolving round another body or a distant point; thus, the daily turning of the earth on its axis is a rotation; its annual motion round the sun is a revolution.

2. Any return or succesion in a series.

  By PanEris using Melati.

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