when i saw ur post...then i started thinking what should be the simplest meaning...n i got this answer . from my mind... hope u like it......
pro.....means proactiveness.....
fessionalism....means...fashion follower......sounds funny naa...but its my way of thinking
in nut shell professionalism means...following fashion of proactiveness ....be it ur personal or professional life...
professionalism doesnt come with professional dressing...it is shown by
ur way of talking
ur way of walking n most important...........
ur way of thinking, ur way of behaving with colleagues, frnds, family....everybody

for example: u r punctual, have gud time management skills, managerial skills...any skill u say...or say u have positive attitude but if u can't talk politely...with ur subordinates...then u think ...wats the use of having so many gud skills.....for professionalism
first u need
behavior skills.....
if u have gud managerial skills only...then u r professional.....but if u have gud behaviour plus mangerial skills then my dear u r a
TRUE PROFESSIONAL.

regards
bhawna