Primitive elvish
rē
noun. single item take out of a (long) series
-rē
suffix. -rē
nōrē
noun. kindred, race
taurē
noun. forest
tō/oto
root. back
-(a)rē
suffix. abstract noun
(a)tata
cardinal. two
atata
root. two, two; [ᴹ√] again, back
atatya
adjective. double
atta
cardinal. two
khan
root. back
lairē
noun. *summer
ndorē
noun. land
ndōro
noun. land
tata
masculine name. Two
yenā
adjective. female
The earliest appearance of this root was ᴹ√TOTO- “repeat” from Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/109). The root appeared as √TŌ/OTO in a discussion of prefixes for “back” from around 1959, where Tolkien specified its meaning as “back as an answer, or return by another agent to an action affecting him, as in answering, replying, avenging, requiting, repaying, rewarding”; Tolkien also considered the forms √UTU/TŪ (PE17/166). In this 1959 note Tolkien crossed √TŌ/OTO through and seems to have replaced it with √KHAN. Tolkien mentioned the root √OT in a discussion of numbers from the late 1960s, but only to specify that “there was no primitive base OT-” (VT47/16).