continuum

noun4

1. •
   A continuous series or whole, no part of which is noticeably different from its adjacent parts, although the ends or extremes of it are very different from each other.
2. •
   A continuous extent.

   • A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place. — 2012
3. •
   The nondenumerable set of real numbers; more generally, any compact connected metric space.
4. •
   A touch-sensitive strip, similar to an electronic standard musical keyboard, except that the note steps are ¹⁄₁₀₀ of a semitone, and so are not separately marked.