Question!

I am reading Robinson Crusoe and am wondering what the word 'viz' means in the literary sense?

It probably is the abbreviation'viz'.
Viz\, adv. [Contr. fr. videlicet.] To wit; that is; namely.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc

Yes. That is my understanding of it as well: namely or by way of.