Definition of "lassie"

I had been on a message for my father, and was walking home along the road, when I saw a tall, fine lassie coming over the bogland on the right hand side of the road.

1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 27

It was the day of warlocks and apparitions, now happily driven out by the zeal of the General Assembly. Witches pursued their wanchancy calling, bairns were spirited away, young lassies selled their souls to the Evil One, and the Accuser of the Brethren, in the shape of a black tyke, was seen about cottage doors in the gloaming.

1902, John Buchan, The Outgoing of the Tide

She was caught in this git-a-man, git-a-bairn, git-a-hoose shite that lassies git drummed intae them, and hud nae real chance ay defining hersel ootside ay they mashed-tattie-fir-brains terms ay reference.

1994 , Irvine Welsh, “Bang to Rites”, in Trainspotting, London: Minerva, page 220

Green grow the rushes, ohGreen grow the rushes, ohThe sweetest hours that e'er I spentAre spent among the lassies, oh

2012, “Green Grow the Rushes”, performed by Celtic Woman