(roofing) a method of valley construction in which the steep-slope roofing on both sides are trimmed along each side of the valley, exposing the metal valley flashing.

The provision of seating or tables without reservations.

A straight razor.

plural of open razor

(topology) Informally, a set such that the target point of a movement by a small amount in any direction from any point in the set is still in the set; exemplified by a full circle without its boundary.

(literally) Total outdoor sunshine, without clouds, haze, or other obstruction. / (figuratively) Openness, transparency, public awareness.

(idiomatic, often business) To reveal confidential information, especially details of one's business operations.

An expanse of an ocean, sea, or large lake which is distant from shore and devoid of nearby islands or other obstructions.

plural of open sesame

partially open; ajar / (mathematics) (referring to an interval on the real line) containing only one of its endpoints