1 fastna
að, to pledge; f. lögbót, K. Þ. K. 24.
2 fastna
β. esp. to betroth, to give the bride away at the betrothal, Grág. i. 302 sqq.; fastnaði Mörðr Rúti dóttur sína, Nj. 3, 51, Band. 3, Ísl. ii. 8, 163, 206, Ld. 22.
3 fastna
γ. reflex. to be betrothed, given awav. Fms. x. 284.