Greek: παρθενος [parthenos] (Noun feminine). A virgin.

παρθενος [parthenos] appears 15 times in the NT:

(1) Matthew 1: 23
Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us. - η παρθενος [hê parthenos] Nom. sing. Lit: "the virgin"

(2) Matthew 25: 1
Then shall the kingdom of heaven be likened unto ten virgins, which took their lamps, and went forth to meet the bridegroom. - παρθενοις [parthenois] Dat. pl.

(3) Matthew 25: 7
Then all those virgins arose, and trimmed their lamps. - αι παρθενοι [hai parthenoi] Nom. pl. ("those virgins" - αι παρθενοι εκειναι [hai parthenoi ekeinai] Lit: "the virgins those").

(4) Matthew 25: 11
Afterward came also the other virgins, saying, Lord, Lord, open to us. - αι παρθενοι [hai parthenoi] Nom. pl.

(5, 6) Luke 1: 27
To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin's name was Mary. - ¹παρθενον [parthenon] Accus. sing. ("to a virgin " - προς παρθενον [pros parthenon]). / ²της παρθενου [tês parthenou] Gen. sing.

(7) Acts 21: 9
And the same man had four daughters, virgins, which did prophesy. - παρθενοι [parthenoi] Nom. pl.

(8) 1 Corinthians 7: 25
Now concerning virgins I have no commandment of the Lord: yet I give my judgment, as one that hath obtained mercy of the Lord to be faithful. - των παρθενων [tôn parthenôn] Gen. pl. ("concerning virgins" - περι των παρθενων [peri tôn parthenôn] Lit: "about the virgins").

(9) 1 Corinthians 7: 28
But and if thou marry, thou hast not sinned; and if a virgin marry, she hath not sinned. Nevertheless such shall have trouble in the flesh: but I spare you. - η παρθενος [hê parthenos] Nom. sing. Lit: "the virgin".

(10) 1 Corinthians 7: 34
There is difference also between a wife and a virgin. The unmarried woman careth for the things of the Lord, that she may be holy both in body and in spirit: but she that is married careth for the things of the world, how she may please her husband. - η παρθενος [hê parthenos] Nom. sing. Lit: "the virgin".

(11) 1 Corinthians 7: 36
But if any man think that he behaveth himself uncomely toward his virgin, if she pass the flower of her age, and need so require, let him do what he will, he sinneth not: let them marry. - την παρθενον [tên parthenon] Accus. sing.

(12) 1 Corinthians 7: 37
Nevertheless he that standeth stedfast in his heart, having no necessity, but hath power over his own will, and hath so decreed in his heart that he will keep his virgin, doeth well. - την παρθενον [tên parthenon] Accus. sing.

(13) [1 Corinthians 7: 38]
So then he that giveth her in marriage [his virgin] doeth well; but he that giveth her not in marriage doeth better. - την παρθενον [tên parthenon] Accus. sing.

(14) 2 Corinthians 11: 2
For I am jealous over you with godly jealousy: for I have espoused you to one husband, that I may present you as a chaste virgin to Christ. - παρθενον [parthenon] Accus. sing.

(15) Revelation 14: 4
These are they which were not defiled with women; for they are virgins. These are they which follow the Lamb whithersoever he goeth. These were redeemed from among men, being the firstfruits unto God and to the Lamb. - παρθενοι [parthenoi] Nom. pl.