Ai! Lá polin saca i quettar!
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A word appearing as kaista or kast “1/10” in notes on numbers from the late 1960s, a combination of √KAYAN “ten” with the fractional suffix -sta.
Neo-Quenya: Since I prefer quëan for “ten”, I would use ᴺQ. quaista “one tenth” for purposes of Neo-Quenya as suggested by Helge Fauskanger (QQ/quaista).
Conceptual Development: The Early Qenya Grammar of the 1920s had ᴱQ. keatto or kesto “one tenth” with adjective forms ᴱQ. keatya or kestya (PE14/51, 84). All of these words were related to 1920s ᴱQ. kea “ten”.