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From Nordan Symposia
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Noun - [[focus]]
Noun - [[focus]]
Plural - countable and uncountable; [[foci]] or focuses
Plural - countable and uncountable; '''foci''' or focuses
*1. (countable) (optics) a point at which reflected or refracted rays of light converge.
*1. (countable) (optics) a point at which reflected or refracted rays of light converge.
*6. (countable) the exact point of where an earthquake occurs, in three dimensions.
*6. (countable) the exact point of where an earthquake occurs, in three dimensions.
The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.
The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.[http://en.wiktionary.org/wiki/focus]
