The Comprehensive Aramaic Lexicon

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PJ Deut6:9 :ותקבעינון בתולתא לקבל תקי על סיפי ביתך ובתרעך מימינא במיעלך : you must afix it at the (top) third against the doorpost upon your houses' thresholds and your gates, on the right as you enter

See the entire entry for tle/oṯ, tu/elṯā num. one third