When was the word learnings first used as a noun, as a synonym for lessons?
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
The answer appears to be in 1483, at least in the plural.
The OED gives sense 2 of the verbal noun learning five different subsenses, of which at least the last (and perhaps others; it is subclear) is marked obsolete. I include a few citations in the plural, with bold emphasis mine.
My personal impression is that the modern use sounds like annoying business jargon or non-native speaker use, and I would not use it myself.
OED has three citations for learning meaning lesson, but it notes it's obsolete.
The latest citation is Shakepeare when he wrote it in 1616 (published 1623).