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soar (third-person singular simple present soars, present participle soaring, simple past and past participle soared) 1  to fly aloft with little effort, as a bird. When soars Gaul's vulture with his wings unfurled. 2  to mount upward on wings, or as on wings. 3  to remain aloft by means of a glider or other unpowered aircraft.
In SOA terms, it's the ability to add or remove services or service capabilities. Such services can reside in a services inventory or can be rendered from a cloud as software (SaaS), infrastructure (Iaas), or as a platform (PaaS) ). A SOA can have broad vertical and horizontal scaling but shallow capabilities.