Continuum (noun)

1. A continuous sequence in which adjacent elements are not perceptibly different from each other, although the extremes are quite distinct.
2. A range of things that can vary in quantity or quality, with no clear point at which one changes into another.

Origin:

From latin continuum "a continuous whole".

Examples:

1. The color spectrum is a continuum of colors.
2. The temperature scale is a continuum from cold to hot.
3. The continuum of care refers to the range of services provided to patients.
4. The continuum of development includes milestones from infancy to adulthood.
5. The continuum of political beliefs ranges from far-left to far-right.