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focal |
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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