Third person singular present of focus, meaning to concentrate attention or effort on a particular subject or activity. To adjust or direct toward a central point.
From Latin focus meaning 'hearth' or 'fireplace,' the central point of the home where heat and light originated. The optical sense developed in the 17th century, and the metaphorical sense of mental concentration followed in the 18th century.
The journey from 'hearth' to 'concentration' shows how Latin focus became our modern 'focus' through the development of optics - just as a hearth was the central gathering point of a home, optical focus became the point where light rays converge. The phrase 'in focus' didn't exist until photography made the concept visually obvious to everyone.
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