concentricityn.

1618 B. Holyday Τεχνογαμια ii. iii. sig. G The Concentricitie and Excentricitie of the Orbes.

1662 J. Chandler tr. J. B. van Helmont Oriatrike 470 That I did with the joy of concentricity or a mutual centredness, purely resign up my tribulations unto my most bountiful Jesus.

1711 D. Sturmy Theol. Theory Plurality of Worlds 7 Much less can they pretend to tell, how those greater Orbs perform their Motions with such an exact and regular Concentricity.

1785 Eng. Rev. June 444 The flashes go from side to side, and lose their force from their want of concentricity.

1803 Edinb. Rev. 1 429 The grand circumstance of concentricity is evidently sufficient to authorise a classification of the new bodies [sc. the asteroids] under the head of planets.

1869 J. Phillips Vesuvius vii. 191 We observe the general concentricity of all the layers.

1927 T. Thornley Cotton Spinning (ed. 4) ix. 311 Metal thread lappets have become very largely used, being much less likely to warp, become damaged or to lose concentricity with the spindles.

1941 U.S. Patent 2,260,283 1/1 The operation of white-metalling is difficult in practice as great care must be observed to ensure concentricity of the parts.

2001 Automatic Machining Apr. 3 (advt.) Allows thread rolling away from the collet and ensures thread concentricity.