Etymology Borrowed 1640–50; earlier fort < Middle French; disyllabic pronunciation by association with Italian forte, from Latin fortis (“strong”). Doublet of fort and fortis.
1
A strength or talent; a strong point.
He writes respectably, but poetry is not his forte.
Between ourselves, the country is rather triste, and you have given me positively a sensation; yet my forte is not the Arcadian: however, I will do my petit possible to console you for the loss of le beau Lindor, who was my predecessor.1837, L[etitia] E[lizabeth] L[andon], chapter XV, in Ethel Churchill: Or, The Two Brides. […], volume II, London: Henry Colburn, […], →OCLC, page 115:
2
The strong part of a sword blade, close to the hilt.