It simply means that you were born on the same day of the year.
From a probabilistic standpoint, assuming a uniform distribution, you have a 1 in 365.25 chance of matching a specific someone else's birthday.
With nearly 7 billion people on this planet, there are probably about 19 million people with each of the possible birthdays living.
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On average, in the entire world about twenty eight thousand people will have the same birthday as one another. In a room full of people, there should be two people who have the same birthday.
1 in 20,000! I know 4 people with my same birthday, 3 of them not being related...
12 because there are 12 months and no one in the room has a birthday in the same month
"Varrying" isn't a word, but the Oxford Dictionary definition of "Varying" is:"differ in size, amount, degree , or nature from something else of the same general class"
Your date of birth will never vary, it will always be the same.