portion

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por·tion

(pōr'shŭn),
Part or division.

por·tion

(pōr'shŭn)
Part or division.

segment of a bifocal lens (seg) 

An area of a bifocal lens of a power different to that of the main portion. Syn. portion. There is the distance portion, which has the correction for distance vision, and the near or reading portion, which has the correction for near vision. See intermediate portion.
References in classic literature ?
I owe it to myself, that I, a friendless, portionless, girl, with a blight upon my name, should not give your friends reason to suspect that I had sordidly yielded to your first passion, and fastened myself, a clog, on all your hopes and projects.
What kind of return would that be which would be comprised in our permitting their nephew, their only relative, whom they regard as a son, and for whom it would be mere childishness to suppose they have not formed plans suitably adapted to the education he has had, and the fortune he will inherit--in our permitting him to marry a portionless girl: so closely connected with us, that the irresistible inference must be, that he was entrapped by a plot; that it was a deliberate scheme, and a speculation amongst us three?
The portionless, who struggle with no such unnecessary inherited encumbrances, find it labor enough to subdue and cultivate a few cubic feet of flesh.