continuum.

continuum

pronunciation: k&n-'tin-yü-&m

1 : a coherent whole characterized as a collection, sequence, or progression of values or elements varying by minute degrees

see also:

space-time

pronunciation: 'spAs-'tIm, 'spAs-"
1 : a system of one temporal and three spatial coordinates by which any physical object or event can be located
2 : the whole or a portion of physical reality determinable by a usually four-dimensional coordinate system; also : the properties characteristic of such an order

(merriam-webster.com)