profession-n; 3 Senses

Sense Number 1: a body of specially-trained, paid workers, usually with higher education

Commentary: PROFESSION[+entity][+social][+body][+people][+worker][+specialist][+paid]
NOTE: refers to the people in the line of work

The medical profession is divided on this issue.
It's the dental profession's largest annual meeting in North America.
Their profession has experienced significant attrition in recent years. (fewer people)

WordNet 3.0 Sense Numbers: 1

Sense Number 2: a specialized livelihood or occupation, usually requiring special training, higher education

Commentary: PROFESSION[+activity][+livelihood][+training][+advanced]
NOTE: refers to the activity of the work, not the people (see Sense 1)

Mary is a lawyer by profession.
Bill switched professions mid-career.
Her chosen profession is teaching.

WordNet 3.0 Sense Numbers: 2

Sense Number 3: a public avowal or affirmation of something

Commentary: PROFESSION[+action][+speech_act][+avowal][+public]

John made a profession of disbelief at the conclusions made by the study.
His artwork, especially the pietas, are a tangible profession of his Catholic faith.
Their profession of allegiance to the new government is being questioned.

WordNet 3.0 Sense Numbers: 3, 4