Clear: Space, Not Absence

To most people, clear means unobstructed or free from obstacles. You clear your desk by removing papers. You clear your throat by expelling phlegm. In both cases, something was in the way and now it is gone.

In carpentry, clear is a dimension. It is the distance between the nearest surfaces of two bodies, measured from edge to edge. If a doorway must have a clear of 32 inches, you measure 32 inches between the inside faces of the two door jambs. A clear between two roof timbers is the open span they create, measured face to face. The word names the gap itself, not the act of creating it.

This sense appears across the trades wherever spacing matters. Ground clearance in automotive work is the measured distance from the ground to the lowest point of the vehicle's underside. Clearspan in construction describes a structural opening free of internal supports. In each case, clear refers to the actual distance, not to the work of removing what was there before.

The carpentry definition comes from the shared root: to make clear originally meant to make bright or visible, and by extension to make empty or free. But once the gap exists, the word shifts from action to measurement. You have cleared the space; now you measure the clear. The industrial use freezes the word at the noun stage, treating the resulting distance as a concrete fact to be specified and verified, not as an ongoing state of being uncluttered.