The phrase "provisional basis" means that something is temporary or not final. It suggests that an arrangement or decision is subject to change or further evaluation. Full definition
One should get to the point of realizing that life is full of mystery, and that all knowledge and conclusions are transitory and provisional based on incoming research. (nakedpastor.com)
Adrien Silva's application to be allowed to join Leicester City on a provisional basis has been turned down by CAS. (skysports.com)
According to an e-mail to Common Council members and city staff attributed to Olinger, Madison Mayor Dave Cieslewicz has asked him to stay on as head of the Department of Planning & Community & Economic Development after Jan. 5 on a provisional basis to «finish a number of projects that are in critical phases of implementation or financing.» (dailyreporter.com)