Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to a focus.
  • adj. Placed at or measured from a focus.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Belonging to, concerning, or located at a focus
  • adj. limited to a small area

from the GNU version of the Collaborative International Dictionary of English

  • adj. Belonging to,or concerning, a focus; as, a focal point.

from The Century Dictionary and Cyclopedia

  • Of or pertaining to a focus: as, a focal point.
  • In optics, of a mirror or lens, the distance (also called the focal length) from its center to the principal focus (see focus); of a telescope, the distance between the focal plane and the object-glass.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. of or relating to a focus
  • adj. having or localized centrally at a focus

Etymologies

From New Latin focālis; synchronically analyzable as focus +‎ -al. (Wiktionary)

Examples

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