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 Origin Middle 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