What does principal abode mean?

[SweetieJean]

Your primary residence.

Principal place of abode in the US - Intuit Accountants Community

[ColeenD3]

It is your main home. It is where you live most of the time.

Abode" has been variously defined as one's home, habitation, residence, domicile, or place of dwelling.  The location of your abode often will depend on where you maintain your economic, family, and personal ties.