Bachelorette

It is derived from the word bachelor, and is often used by journalists, editors of popular magazines, and some individuals. "Bachelorette" was famously the term used to refer to female contestants on the old Dating Game TV show.
In Canada, the term bachelorette also refers to a small bachelor apartment.The term bachelor apartment, used in Canada and South Africa, refers to an apartment with only one large room serving as a bedroom and living room plus a separate bathroom (see studio apartment).
Derivation
The more proper neologism would be bacheloress, since the -ess suffix is the standard English suffix denoting a female subject, while -ette is a French-origin diminutive suffix, indicating that the subject is smaller and is of feminine gender. However, in American English the -ess suffix is only marginally morphologically productive, and the -ette suffix can indicate a feminine version of a noun without a change in size (though many such words in -ette were intended to be jocular when they were first coined).
Reasons for use
The traditional English term for a woman who has never married is a spinster, while a woman who is divorced is a divorcée, and a woman whose spouse has died is a widow.All three of these terms have carried negative cultural connotations at one time or another. Spinster often implied that the woman was older than the age when most women traditionally marry and that she would probably never marry, more extremly thes were defined as an 'old maid'.The term widow may be associated with an older woman (although a woman can be a widow at any age). Divorcée and widow are also indicative that the woman no longer has her virginity.