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technical usage

The satellite dish focuses the signal into a relatively narrow beam.
  Technical usage typically involves some sense of center or concentration such as:

  • physics — a point of convergence such as the point where light rays meet

  • geometry — a fixed reference point (as of a parabola)

  • geology — the point of origin of an earthquake

See a comprehensive dictionary for other less common meanings.
 Mark word for later review on this computer
focus focuses focused focusing focusses focussed focussing focal foci
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  • The satellite dish focuses the signal into a relatively narrow beam.
  • The focus of a parabola is a fixed point on the interior of the parabola used in the formal definition of the curve.
  • For the first time on the island, Piggy himself removed his one glass, knelt down and focused the sun on tinder.
    William Golding  --  Lord of the Flies
  • But it has a tight enough beam. Well-focused. You can aim it and make a three-inch circle of light on a wall a hundred meters off.
    Orson Scott Card  --  Ender’s Game

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  • Maybe tear big chunks out of them by reflecting the planet’s own gravity back on itself, only from another direction, and focused down to a smaller point.
    Orson Scott Card  --  Ender’s Game
  • Galileo’s Illuminati, however, saw perfection in the ellipse as well, revering the mathematical duality of its twin foci.
    Dan Brown  --  Angels & Demons
  • A few foci have been fully reabsorbed, the pocket has grown smaller and is more sharply defined, which, being a well-informed patient, you know indicates healing.
    Thomas Mann  --  The Magic Mountain
  • The foci of infection are steadily extending.
    Albert Camus  --  The Plague
  • Piggy stood behind him, islanded in a sea of meaningless color, while Ralph knelt and focused the glossy spot.
    William Golding  --  Lord of the Flies
  • At the focal point of two beams, it sets up a field in which molecules can’t hold together anymore.
    Orson Scott Card  --  Ender’s Game

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  • You can’t see through the shield to aim and focus the beams, but since the generator of the Ecstatic Shield is always in the exact center, it isn’t hard to figure it out.
    Orson Scott Card  --  Ender’s Game
  • One, two, four, seven of his fighters were blown away. It was all a gamble now, whether any of his ships would survive long enough to get in range. It would not take long, once they could focus on the planet’s surface.
    Orson Scott Card  --  Ender’s Game
  • …about how the bacillus irritated the cells of the tissue in the bronchi and air sacs of the lungs, about the formation of tubercles and the production of soluble intoxicating toxins, the deterioration of the cells and the process of caseation, which if it continued to petrify into chalky scar tissue meant a beneficial arrest of the disease, but if it went on to build ever-larger soft foci, created cavities that ate away at everything around them and finally destroyed the entire organ.
    Thomas Mann  --  The Magic Mountain
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Associated words [difficulty]:   focus [1]
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