Basis
From 'Vocabulary' part of The ABC Of Plain Words by Sir E Gowers (1951)

Basis, like nature and character and some other similar words, lures writers into roundabout ways. When you find you have written "on a . . . basis" always examine it critically before letting it stand.

Please state whether this is to be a permanent installation or on a temporary line basis. (Or a temporary line.)
If it is your intention to conduct the business arising from the use of these samples on the basis of manufacture for export. . . (If the business arising from your use of these samples will be manufacture for export. . . . )
The issue of import licences on 100 per cent re-export basis. (The issue of import licences for re-export only.)
These will however remain Government property, being issued on a loan basis only. (Being issued on loan only.)
It has been found necessary to supply some markets on a ration basis.(To ration the supply to some markets.)

A legitimate use of basis is:

The manufacturers are distributing their products as fairly as possible on the basis of past trading.