Einsteinian

Referring to equations (1) and (2), which give respectively the Newtonian-Einsteinian transformations and the transformations from R and L times to Newtonian or Einsteinian times, we see a decided resemblance between them.

Source: wiktionary

The blasphemies which appeared on earth, it was hinted, came from the dark planet Yuggoth, at the rim of the solar system; but this was itself merely the populous outpost of a frightful interstellar race whose ultimate source must lie far outside even the Einsteinian space-time continuum or greatest known cosmos.

Source: wiktionary

If a physicist in the early part of this century were trying to decide whether to accept an Einsteinian conception of space and time, the issue would not be, 'Is the Einsteinian account true?' […] The issue to be addressed is the pragmatic question of whether the new Einsteinian conception seems to solve what are regarded as the most pressing current puzzles, has the greater scope for future explanation, etc.

Source: wiktionary

This talk of pre-Einsteinian and Einsteinian worlds reveals another facet to the dilemma between the two interlocutors.

Source: wiktionary