1) The current meanings of “chaste” in the OED:
pure from sexual intercourse;
free from indecency;
subdued (referring to artistic style).
2) The current meanings of “celibate”:
unmarried, single, bound not to marry;
one who leads a single life; a confirmed bachelor or spinster; one bound not to marry.
I would add that celibate also means abstaining from sex, which is how it’s more commonly used today.
3) The current meanings of “virgin” pertinent to this topic:
An unmarried or chaste maiden or woman, distinguished for piety or steadfastness in religion, and regarded as having a special place among the members of the Christian church on account of these merits. Chiefly used with reference to early Christian times;
A woman (esp. a young woman) who is, or remains, in a state of inviolate chastity;
A young woman, a maid or maiden, of an age and character affording presumption of chastity;
A person of either sex remaining in a state of chastity;
A youth or man who has remained in a state of chastity.
There are several other meanings, for instance that describing a female insect producing fertile eggs by parthenogenesis, which are outside the scope of this discussion.
4) OED’s definition of “Holy Ghost”:
The Divine Spirit; the Third Person of the Godhead, the Holy Spirit.
I think that, etymologically speaking, that answers venemousbede’s
I was more interested in what the Holy Ghost is and how it can be defined and what people’s perceptions of what it is are. This is word stuff and has been covered here before but not definitively. These digressions all add to our store of knowledge. The differences between chaste, celibate and virgin for example.
Apart, of course, from “what people’s perceptions of it are”, which is nothing whatsoever to do with words and their origins.
Nor does “parthenogenesis” have much to do with the topic, but for the sake of completeness, here’s its definition:
Reproduction from a gamete without fertilization, occurring most commonly in invertebrates and lower plants. Formerly also: asexual reproduction, as by fission or budding.
The origin of “partheno-” is:
ancient Greek -, combining form (in e.g. a person who ogles maidens, seducer) of virgin, of unknown origin. An interesting twist to the tale.