A somewhat formal or literary conjunction that acknowledges a preceding statement while introducing a contrasting or qualifying point. Often used in written or formal speech.
それでも means 'even so' and is more conversational. さりとて is more literary and often used in written arguments.
Etymology
Derived from classical Japanese 然り (sari, 'it is so') + とて (tote, 'even though'). The exact historical development is uncertain, but it functions as a fixed conjunction in modern Japanese.
