Frequency: The word is one of the 3000 most common words in English.
You use ~ to indicate that a statement is generally true, for example true about the majority of a group of things or people, true most of the time, or true in most respects.
I am working with ~ highly motivated people...
Cars are ~ metal.
...men and women, ~ in their 30s...
= mainly
ADV: ADV with cl/group