The phrase "on a temporary basis" means for a short period or temporarily. It refers to something that is happening, existing or being used only for a limited time and not permanently.
Sentences with «temporary basis»
We do not accept payment by credit card on temporary basis. (hostelbookers.com)
Initially on a minimum 1 - month temporary basis with the realistic possibility of the position turning into a full time permanent role. (targetjobs.co.uk)
We are seeking to recruit an electrically biased facilities engineer to join our existing team on a 3 month temporary basis due to sickness. (cv-library.co.uk)