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 ?
Other figures, such as the dog in the second, third, and fourth books, or the marriage of the portionless maiden in the sixth book, or the drones and wasps in the eighth and ninth books, also form links of connection in long passages, or are used to recall previous discussions.
Hargrave's anxiety to make good matches for her daughters is partly the cause, and partly the result, of these errors: by making a figure in the world, and showing them off to advantage, she hopes to obtain better chances for them; and by thus living beyond her legitimate means, and lavishing so much on their brother, she renders them portionless, and makes them burdens on her hands.
George, always the champion of his regiment, rose immensely in the opinion of the youth of the corps, by his gallantry in marrying this portionless young creature, and by his choice of such a pretty kind partner.