foci

/ˈfəʊ.kaɪ/

IPA: /F OW1 K IY0/

noun

1
A point at which reflected or refracted rays of light converge.
“The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire.”
2
A point of a conic at which rays reflected from a curve or surface converge.
3
The fact of the convergence of light on the photographic medium.
“Unfortunately, the license plate is out of focus in this image.”
4
The quality of the convergence of light on the photographic medium.
“During this scene, the boy’s face shifts subtly from soft focus into sharp focus.”
5
Concentration of attention.
“I believe I can bring the high degree of focus required for this important job.”
6
The exact point of where an earthquake occurs, in three dimensions (underneath the epicentre).
“The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.”
7
The indicator of the currently active element in a user interface.
“Text entered at the keyboard or pasted from a clipboard is sent to the component which currently has the focus.”
8
The most important word or phrase in a sentence or passage, or the one that imparts information.
9
An object used in casting a magic spell.

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