ba·sis /'bas?s/ noun the underlying support or foundation for an idea, argument, or process. "trust is the only basis for a good working relationship" the system or principles according to which an activity or process is carried on. "she needed coaching on a regular basis" Similar: starting point base point of departure beginning premise fundamental point/principle principal constituent main ingredient cornerstone core heart thrust essence kernel nub underpinning groundwork footing condition status position arrangement system method procedure way the justification for or reasoning behind something. "on the basis of these statistics important decisions are made" Similar: foundation support base footing reasoning rationale defense reason grounds justification rationalization motive motivation cause Feedback