Vine's Expository Dictionary of NT Words
an adjective from deka, "ten," occurs in John 1:39; Revelation 11:13; 21:20 .
grammatically the feminine form of No. 1, with meris, "a part," understood, is used as a noun, translated "a tenth part" in Hebrews 7:2 , "a tenth," Hebrews 7:4; "tithes" in Hebrews 7:8,9 .
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Vines, W. E., M. A. Entry for 'Tenth'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/t/tenth.html. 1940.