stand-alone ( synonym found)
Definition of stand-alone:

°Operating, functioning, or existing without additions or assistance; independent; able to be separate or separated.
"They offer an inexpensive add-on for a computer, or a stand-alone system with all the functions built in."
Definition of stand-alone:

°Operating, functioning, or existing without additions or assistance; independent; able to be separate or separated.
"They offer an inexpensive add-on for a computer, or a stand-alone system with all the functions built in."
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