(topology, mathematical analysis, restricted to metric spaces) The set of all points in a metric space whose distance from a given point ("the open ball's center") is less than a given length ("the open ball's radius").

plural of open verdict

To begin operations; to set things in motion.

A morning on which an establishment (such as a school or business) is open to the public, allowing visitors to view the premises and learn about the operation of the organisation.

Third-person singular simple present indicative form of open the floodgates

present participle of open the floodgates

(idiomatic) To allow some action to proceed more swiftly or to a greater extent

simple past tense and past participle of open the floodgates

present participle of open up

(now rare) Frank, unsecretive; not concealing one's feelings. / With the breast exposed; (of clothing) not covering the breast.