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

plural of open-side

plural of tin-opener

A business model for software whereby the core is open-source and free, while closed-source add-ons are available for purchase.

plural of opening time

plural of open system

plural of open syllable

plural of open fire

plural of pew-opener

(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).