(n) entertainment
(P)
(n) orchestra box
(n) orchestration
(n) Australopithecus (lat:)
(n) War of the Austrian Succession (1740-1748)
(n) ostrich leather
(n) Austro-Asiatic languages
(n) Austronesian languages
(n) (comp) auto-increment
(n) automatic transmission
(n) oatmeal cookie
(n) (comp) automatics
(n) overnight bag
(n) (comp) overflow route
(n) (comp) OpenClient
(n) (comp) open network
(n) open tournament
(n) all-weather coat
(n) all-weather coat
(n) all-season coat
(n) all-star cast
(P)
(n) old liberalist
(n) ostrich policy
(n) (comp) offline storage
(n) (comp) object file
(n) (comp) object browser
(n) (comp) object descriptor type
(n) (comp) object-oriented language
(n) (comp) object identifier type
(n) (comp) online storage