Yrða

tvívegis

atviksorð tví-vegis

adv. ‘two-ways’ to and fro; fara t., to go back again, Ísl. ii. 327, Fms. iii. 83, vi. 119, Grág. i. 213, 436: hence in mod. usage gener. twice.

Skammstafanir og tilvitnanir

Skammstafanir

adv.
atviksorð (e. adverb)
mod.
modern.
gener.
generally.

Tilvitnuð rit

Fms.
Fornmanna sögur. (E. I.)
Grág.
Grágás. (B. I.)