randa noun "cycle, age" (100 Valian Years) (RAD, cf. LR:171: "an age, which is 100 years of the Valar"). A Valian year is equated with ten of "our" years (LR:171), making a randa the equivalent of 1,000 solar years (but possibly the word can also be used for "age" in general).
Quenya
ialë
everlasting age
randa
cycle, age
[ialë noun "everlasting age" (GEY; the word "age" dropped out in the Etymologies as printed in LR; see VT45:14. Replaced by oialë.]