unilinear

adjective
UK /ˌjuːnɪˈlɪniə/
US /ˌjuːnɪˈlɪniər/

Following just one straight line or path.

The teacher drew a unilinear path on the map from the school to the park.


OTHER MEANINGS

2. Developing or changing in a single direction without branching or going back.

The story follows a unilinear plot from beginning to end.

3. In anthropology, describing a theory that all societies evolve through the same fixed stages.

Early anthropologists proposed a unilinear model of cultural evolution.

4. Having only one line of descent or inheritance.

The family traced its unilinear ancestry through the father's side.

5. Arranged in a single row or series.

The chairs were placed in a unilinear arrangement along the wall.