That separates or divides; that causes a separation or division of parts; forming a boundary or interval between two or more things.

That divides, in various senses; that cleaves into parts; †‘running divisions’ in singing (quot. 1640; see division, n. 7); that separates regions…

Dividing; distributive. Esp. in divident fence, divident line (cf. dividing, adj.).

Of, relating to, or of the nature of a partition; characterized by partition.

Of the nature of a partition-wall; dividing one space from another.

That separates, in various senses of the verb. †separating line = separatrix, n.