3 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Focal \Fo"cal\, a. [Cf. F. focal. See {Focus}.]
Belonging to,or concerning, a focus; as a focal point.
{Focal distance, or length, of a lens or mirror} (Opt.), the
distance of the focus from the surface of the lens or
mirror, or more exactly, in the case of a lens, from its
optical center.
{Focal distance of a telescope}, the distance of the image of
an object from the object glass.
From WordNet r 1.6 [wn]:
focal
adj 1: having or localized centrally at a focus; "focal point";
"focal infection"
2: of or relating to a focus; "focal length"
From The Free On-line Dictionary of Computing (13 Mar 01) [foldoc]:
FOCAL
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)
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