Yes. 50 levels.
Tumah is the absence of kedusha within a “kli” that can hold kedusha. For example, a non Jewish corpse isn’t tamei meis as it never had the ability to have kedusha in the first place.
The 50 levels of tumah (that we’re told by Yetzias Mitzrayim the hidden were at the 49th level), are levels of kedusha we potentially could have achieved. So the yidden were essentially lacking in 49 levels of kedusha.