-alis

of, relating to

Forms

-alis
-aris — Latin variant especially used when the stem already contained l, avoiding a repeated l sound.
-al — English ending borrowed through French or directly from Latin.
-ar — English ending continuing Latin -aris.

Origin

An older Latin adjective-forming suffix; its more remote ancestry is uncertain.

Note

Expresses a relationship without specifying its kind: material, place, purpose, and other connections are possible.

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adjective

areal

AIR-ee-uhl/ˈɛriəl/

Relating to an area or region.

The shaded map highlights the region's areal extent within its boundary.

A simple geographic map emphasizes one bounded region as an entire surface area, with a restrained wash covering its interior and geographic features continuing across its boundary.

Etymology

areLatinopen space or level ground

+alLatinof, relating to

The base originally named open, level ground and broadened to a bounded space. The adjective ending makes areal describe something in relation to such a space or geographic region.

More examples

Researchers measured the forest's areal coverage.
The survey examines areal differences in rainfall.
The linguist studies areal features shared by neighboring languages.

Similar words

regional: Usually relates to a geographic region rather than measured area.
spatial: Concerns position and space more generally.