atta (1) cardinal "two" (AT(AT), Letters:427, VT42:26, 27, VT48:6, 19). Elen atta "two stars" (VT49:44); notice how a noun is indeclinable before this numeral, and any case endings are "singular" and added to the numeral rather than the noun, e.g. genitive elen atto "of two stars" (VT49:45). Attalyar "Bipeds" (sg. *Attalya) = Petty-dwarves (from Sindarin Tad-dail) (WJ:389). A word atta_ "again" was struck out; see the entry _TAT in Etym and cf. ata in this list.
Quenya
yúyo
both
yúyo
adjective. both
atta
cardinal. two
satto
cardinal. two
satto, "Qenya" numeral "two" (in Tolkiens later Quenya atta) (VT49:54)
atta
cardinal. two
yu-
prefix. both, both, [ᴱQ.] twice
yúyo noun? adv.? "both" (YŪ, VT48:10). Used adjectivally in yúyo má "both hands"; notice that the noun following yúyo receives no plural or dual marker.