<p><strong>Noun</strong></p><ul><li>a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts.</li><li>close attention or concentration: Some of the warning signs indicating you should pull over: drifting between lanes, repeated yawning, tailgating, and trouble maintaining focus.</li><li>the ability to concentrate one’s attention or to sustain concentration: Mindfulness and meditation are often suggested to help manage stress, increase awareness of emotions, and improve focus.</li><li>Physics: a point at which rays of light, heat, or other radiation meet after being refracted or reflected.</li><li>Optics: the focal point of a lens, on which rays converge or from which they deviate.</li><li>Geometry: (of a conic section) a point having the property that the distances from any point on a curve to it and to a fixed line have a constant ratio for all points on the curve.</li><li>Geology: the point of origin of an earthquake.</li><li>Pathology: the primary center from which a disease develops or in which it localizes.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to bring to a focus or into focus; cause to converge on a perceived point: to focus the lens of a camera.</li><li>to concentrate: to focus one’s thoughts; to focus troop deployment in the east.</li><li>(used without object) to be or become focused: My eyes have trouble focusing on distant objects.</li><li>to direct one’s attention or efforts: Students must focus in class.</li></ul>