I. noun 1. the underlying support or foundation for an idea, argument, or process • trust is the only basis for a good working relationship.
2. [with adj.] — the system or principles according to which an activity or process is carried on • she needed coaching on a regular basis.
3. the justification for or reasoning behind something •
on the basis of these statistics important decisions are made.
– origin late 16th cent. (denoting a base or pedestal): via Latin from Greek, ‘stepping’. Compare with base1.