Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
LET, adj. Light, in phr. let day, “a day when you have little to do” (Dmf. 1894 Trans. Dmf. & Gall. Antiq. Soc. 1.51).
[Appar. a variant of Eng. light. See P.L.D. § 111.2. Hardly from O.N. lettr, light, easy.]