concentrates

verb concentrates

• foci — a plural of focus.
• muses — to think or meditate in silence, as on some subject.
• centers — Plural form of center.
• centres — Geometry. the middle point, as the point within a circle or sphere equally distant from all points of the circumference or surface, or the point within a regular polygon equally distant from the vertices.
• needs — of necessity; necessarily (usually preceded or followed by must): It must needs be so. It needs must be.