focal

[foh-kuhl]
adjective
of or pertaining to a focus.

Origin:
1685–95; < Neo-Latin focālis. See focus, -al1

focally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
focal (ˈfəʊkəl)
 
adj
1.  of or relating to a focus
2.  situated at, passing through, or measured from the focus
 
'focally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

focal
1690s, from focus + -al (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

focal fo·cal (fō'kəl)
adj.
Of or relating to a focus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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FOLDOC
Computing Dictionary

FOCAL definition


1. FOrmula CALculator.
An interactive system written by Rick Merrill of DEC in 1969 for PDP-5 and PDP-8. It was a descendant of AID/JOSS.
Versions: FOCAL-69, FOCAL-1971, FOCAL-11 (for PDP-11 under RT-11).
(1994-12-21)
2. Forty-One CAlculator Language.
The programming language of the HP-41 calculator line.
(1994-12-21)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Although designed to focus solar energy towards a single focal point to boil a liquid and drive a steam generator.
The dining room's focal point is not the chandelier, as is often the case, but
  the window treatment.
Still the focal point of many interior living spaces, the latest fireplaces
  look anything but traditional.
There are neither the optical effects of varying focal lengths nor the full
  quality, since only part of the pixels have been used.
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