Learner's definition of MY
1 always used before a noun : relating to or belonging to me
: made or done by me
Welcome to my home.
I enjoy my job very much.
My favorite TV show was on last night.
My name is John.
When I woke up this morning, my head ached and my throat was sore.
My wife and I both love to dance.
2 always used before a noun — used to express affection for someone you are talking to
How are you, my friend?
Come with me, my love.
Sleep well, my child.
3 informal — used by itself and in phrases to express surprise, excitement, or fear
Oh my, what a wonderful gift!
Oh, my goodness. What happened to you?
Oh my Lord, look at the time!
My God, you must be joking!