There are 2 definitions of my in English:

my1

Syllabification: my

determiner

1Belonging to or associated with the speaker: my name is John my friend
1.1 informal Used with a name to refer to a member of the speaker’s family: my Francine won top honors in the science fair
1.2Used with forms of address in affectionate, sympathetic, humorous, or patronizing contexts: my dear boy my poor baby
2Used in various expressions of surprise: my goodness! oh my!

Origin

Middle English mi (originally before words beginning with any consonant except h-), reduced from min, from Old English mīn (see mine1).

Definition of my in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous

There are 2 definitions of my in English:

MY2

Line breaks: MY

Entry from British & World English dictionary

abbreviation

Motor yacht: MY Fleury

Definition of my in: