The definition of a focus is the central point of attention.(noun)
An example of focus is a newborn baby in a family.
Focus is defined as to concentrate on something in particular.
Focus is defined as to bring into view.(verb)
See focus in Webster's New World College Dictionary
Origin: ModL, adopted in math. senses by Johannes Kepler (1604) < L, fireplace, hearth < ? IE base *bhok-, to flame, burn > ? Arm bo, flame
See focus in American Heritage Dictionary 4
noun pl. fo·cus·es or fo·ci (-sīˌ, -kīˌ)
Origin: Latin, hearth.
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