**Cir"cu*lar** (?), a. [L. *circularis*, fr. *circulus* circle: cf. F. *circulaire*. See Circle.]

**1.**

In the form of, or bounded by, a circle; round.

**2.**

repeating itself; ending in itself; reverting to the point of beginning; hence, illogical; inconclusive; as, **circular** reasoning.

**3.**

Adhering to a fixed circle of legends; cyclic; hence, mean; inferior. See Cyclic poets, under Cyclic.

Had Virgil been a **circular** poet, and closely adhered to history, how could the Romans have had Dido?
*Dennis.*

**4.**

Addressed to a circle, or to a number of persons having a common interest; circulated, or intended for circulation; as, a **circular** letter.

A proclamation of Henry III., . . . doubtless **circular** throughout England.
*Hallam.*

**5.**

Perfect; complete.

[Obs.]

A man so absolute and **circular**
In all those wished-for rarities that may take
A virgin captive.
*Massinger.*

Circular are, any portion of the circumference of a circle. -- Circular cubics Math., curves of the third order which are imagined to pass through the two circular points at infinity. -- Circular functions. Math. See under Function. -- Circular instruments, mathematical instruments employed for measuring angles, in which the graduation extends round the whole circumference of a circle, or 360°. -- Circular lines, straight lines pertaining to the circle, as sines, tangents, secants, etc. -- Circular note or letter. (a) Com. See under Credit. (b) Diplomacy A letter addressed in identical terms to a number of persons. -- Circular numbers Arith., those whose powers terminate in the same digits as the roots themselves; as 5 and 6, whose squares are 25 and 36. *Bailey*. *Barlow*. -- Circular points at infinity Geom., two imaginary points at infinite distance through which every circle in the plane is, in the theory of curves, imagined to pass. -- Circular polarization. Min. See under Polarization. -- Circular or Globular sailing Naut., the method of sailing by the arc of a great circle. -- Circular saw. See under Saw.

© Webster 1913.

**Cir"cu*lar**, n. [Cf. (for sense 1) F. *circulaire*, lettre *circulaire*. See Circular, a.]

**1.**

A circular letter, or paper, usually printed, copies of which are addressed or given to various persons; as, a business **circular**.

**2.**

A sleeveless cloak, cut in circular form.

© Webster 1913.