A word appearing as ᴱQ. yullume “twice” in the Early Qenya Grammar of the 1920s, a combination of ᴱQ. yúyo “two” and ᴱQ. -llume “times” (PE14/51, 84).

Neo-Quenya: In Tolkien’s later writings yúyo means “both” and atta means “two”. However, I would retain ᴺQ. yullumë “twice, two times” for purposes of Neo-Quenya since the prefix yu- is still used for double/twice in Tolkien’s later writings in words like yunquë “twelve” = “*twice six” or yucainen “twenty” = “*twice ten”.