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Open access, an access-provision practice that can take two forms: open access publication, such as Hybrid open access journals, and open access self-archiving

OpenAccess, a common database initiative in Electronic design automation

Open Access Same-Time Information System, a policy for transmission service by Federal Energy Regulatory Commission.

Right of public access to the wilderness, a legal right to travel through open countryside.

Open Communication, Open access to communications instrastructure and services.