As per my thoughts professionalism is:
1) The way we carry ourselves at work.
2) set examples for others
3) Commitment towards your work and commitments
4) Adhere rules, regulation & policies of organization
5) Being proactive, assertive, confident, punctual.
6) Should be good in people management
7) Good communicator & listener
Good team player, leader.
9) Able to handle responsibility and understands the do & don't.
10) Knows about limitations and able to draw line between personal & official life.

Regards,
Nitin Jagdale