A small or narrow opening, gap, slit, or hole.
The diameter of such a hole which restricts the width of the lightpath through the whole system. For a telescope, this is the diameter of the objective lens.
A hole which restricts the diameter of the lightpath through one plane in an optical system.
The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
The maximum angle between the two generatrices.
A long, narrow channel or depression; e.g., such a slot cut into a hard material to provide a location for an engineering component, a tyre groove, or a geological channel or depression.
A shaft or excavation.
A racing line, a path across the racing circuit's surface that a racecar will usually track on. (Note: There may be multiple grooves on any particular circuit or segment of circuit)
The middle of the strike zone in baseball where a pitch is most easily hit.
A fixed routine.
A pronounced, enjoyable rhythm.
To perform, dance to, or enjoy rhythmic music.
To cut a groove or channel in; to form into channels or grooves; to furrow.