(~s)
Your ~ is the first of the names that were given to you when you were born. You can also refer to all of your names except your surname as your ~s.
Her ~ was Mary. I don’t know what her surname was.
N-COUNT: usu poss N
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If two people are on first-name terms, they know each other well enough to call each other by their ~s, rather than having to use a more formal title.
The two were said to have been on first-name terms...
PHRASE: usu v-link PHR, oft PHR with n