I defined a dictionary variable Dict, populated it, and print(dict) in the first cell of my notebook. In the next cell, I executed the command print(dict) again. However, this time it gave me an error

NameError: name 'Dict is not defined

How can that be? Why am I able to print this variable in one cell, but unable to do so in the next cell?

I can confirm that your answer at least pointed me in the right direction.

It seems my issue wasn't exactly the same as I was instead using the magic pip command to install a notebook scoped package:
%pip install <some-package>

Anything defined within that command cell seems to be lost so I had to separate this into it's own command before everything else.

Thank you for the help!