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open prison
open punctuation
open repo
open sandwich
open season
open secret
open sentence
open sesame
open set
open shop
open side
open-skies
open slather
open society
open stock
open system
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open set
o·pen set (plural o·pen sets)


noun 
Definition:
 
one of family of sets: a mathematical set that is included within a family of sets topology
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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