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