Frequency: The word is one of the 3000 most common words in English.
You use ~ after numbers from one to twelve to say what time it is. For example, if you say that it is 9 ~, you mean that it is nine hours after midnight or nine hours after midday.
The trouble began just after ten ~ last night...
I went to sleep, and at two ~ in the morning I woke up.
ADV: num ADV