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bastion. n. 1. (Fortifications) a projecting work in a fortification designed to permit fire to the flanks along the face of the wall. 2. any fortified place. 3. a thing or person regarded as upholding or defending an attitude, principle, etc: the last bastion of opposition.
Techopedia explains Bastion Host. The bastion host node is usually a very powerful server with improved security measures and custom software. It often hosts only a single application because it needs to be very good at what it does. The software is usually customized, proprietary and not available to the public.