the world > space > relative position > quality of having sides or being a side > [noun] > something at the side (9)
A lateral part, member, or object; something situated at or issuing from the side; esp. a side road or channel.
a piece or part forming the side of something, or attached or fixed at the side.
Anything which flanks or adjoins laterally. a side-wall of a courtyard; a wing of a building.