The time of day when a business, office, school, etc. opens to the public.

(chiefly US) The practice of openly carrying a firearm in public.

Relating to, or characteristic of, the genre of space opera.

plural of Opium War

(historical) The First Opium War or the Second Opium War, two Anglo-Chinese disputes in the mid-19th century.

plural of open-side

Alternative form of eye-opener

Synonym of wireless operator or radio operator (a person who operates a wireless set / radio communications device)

(informal) To open (a bottle, can, etc. of drink, especially alcoholic drink), especially in order to celebrate; also extended to other packaged items. / (informal) To start reading (a book).

plural of opera glove