a girl or young woman: a female past childhood but not yet settled as a wife or mother, often one of marriageable age
This is the everyday Hebrew word for a young female, the counterpart to the common word for a boy or young man. It covers the years between childhood and full adult standing as a wife, so it can name a little girl, a teenager, or a young woman ready for marriage. Context, not the word itself, tells you which.
Most often it points to a young woman of marriageable age, which is why it fills stories of courtship and the laws about marriage. Rebekah is this word when the servant first meets her at the well, and the marriage laws use it again and again for the young woman whose protection and honor are at stake. The same word can shrink to a small child, as with the captured Israelite girl who waits on Naaman's wife, or simply mean any unmarried young woman, like the candidates gathered for the king in Esther.
A closely linked use is the young woman who serves in a household. A wealthy woman traveled with her own young attendants, and these maids are named with this same word. The girl is not a different kind of person here. She is simply a young woman in someone's service, which is why one word covers both the daughter at home and the maid in the household.
The word carries no built-in claim about whether she is a virgin. Where the text needs to stress that, it adds another word or a phrase, so reading sexual status into this term by itself goes beyond what it says.