Definition of "preindustrial"

Civilization has already exceeded a global warming of ~1.0◦C above pre-industrial conditions[.]

2021 January 13, Corey J.A. Bradshaw et al., “Underestimating the Challenges of Avoiding a Ghastly Future”, in Frontiers in Conservation Science‎

At last year’s summit in Glasgow, countries agreed to focus on limiting global temperature rises to 1.5C above pre-industrial levels, but recent UN reports have shown that current policies would raise temperatures by about 2.5C.

2022 November 4, Fiona Harvey, “UN chief warns ‘we will be doomed’ without historic climate pact”, in The Guardian‎