|Examples/ definitions with source references|
1) http://www.merriam-webster.com/dictionary/sec...1: one employed to handle correspondence and manage routine and detail work for a superior
a : an officer of a business concern who may keep records of directors' and stockholders' meetings and of stock ownership and transfer and help supervise the company's legal interests
b : an officer of an organization or society responsible for its records and correspondence
: an officer of state who superintends a government administrative department
2)https://ahdictionary.com/word/search.html?q=s...1. A person employed to handle correspondence, keep files, and do clerical work for another person or an organization.
2. An officer who keeps records, takes minutes of the meetings, and answers correspondence, as for a company.
3. An official who presides over an administrative department of state.
a person whose work is keeping records, taking care of correspondence and other writing tasks, etc. as for an individual in a business office
an officer of a company, club, etc. having somewhat similar functions
(US, [often S-]) an official in charge of a department of government
a person who handles correspondence, keeps records, and does general clerical work for an individual, organization, etcthe official manager of the day-to-day business of a society or board
While it's hard to prove anything by lack of an example, note that the two AE dictionaries do not include the definition "the official manager of the day-to-day business of a society or board" that Collins (but not Oxford) shows.
Perhaps the English could be supplemented with both "Brit." as well as a parallel to the German "Verein, Organisation, etc.", i.e. "club, society, association, etc." (depending on feedback from BE speakers).
Note that in the AE definitions, the secretary is an officer of an organization or concern, i.e., on the board or similar. If an organization or concern had a person outside of the board or similar that was known as the secretary, that person in AE would not be a manager, etc., but rather "a person who handles correspondence, keeps records, and does general clerical work for an individual, organization, etc."
Also note that the AE definition in Collins [3)] omits the definition "the official manager of the day-to-day business of a society or board" that is found in the BE version of Collins [4)].