Letters that make so long
s, o, g, l, n are letters that make 'so long'
1 possible definitions for 'so long'
Under this definition, so long is a noun and has the following properties:
good-bye, adios, arrivederci, auf wiedersehen, au revoir, bye, bye-bye, cheerio, good-by, goodby, goodbye, good day, sayonara, adieu have the same meaning as 'so long'
'so long' can be a type of farewell, word of farewell.