Definition of thy determiner from the Oxford Advanced Learner's Dictionary



BrE BrE//ðaɪ//
; NAmE NAmE//ðaɪ//
(old use)
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a word meaning ‘your’, used when talking to only one person Honour thy father and thy mother. Before a vowel sound, the form is thine
BrE BrE//ðaɪn//
; NAmE NAmE//ðaɪn//
Word OriginMiddle English thi (originally before words beginning with any consonant except h), reduced from thin, from Old English thīn, of Germanic origin.
See the Oxford Advanced American Dictionary entry: thy