noun

• A senior secretary or official with administrative or legal duties, sometimes in charge of some area of government such as finance or justice.
  "[page 111] […] Lord Falkland […] took an Opportunity to tell the King, that He had now a good Opportunity to prefer Mr. Hyde, by making him Chancellor of the Exchequer, in the Place of Sir John Colepepper; […] [page 112] He [Colepepper] ſurrendered his Office of Chancellor of the Exchequer: And the next Day Mr. Hyde was ſworn of the Privy-Council, and Knighted, and had his Patents ſealed for that Office."
• (Christianity) A senior record keeper of a cathedral; a senior legal officer for a bishop or diocese in charge of hearing cases involving ecclesiastical law.
  "The Chancellor, as he is commonly called, who presides in the Diocesan Court, is appointed by the Bishop to the two ancient offices of Vicar General and Official Principal. When the Bishop, as was frequently the case, was absent from the Diocese, or for any other reason was unable to act in person, the Vicar General, as the name denotes, was his usual representative, while the exercise of his judicial authority he delegated to the Official Principal. For a long period of time the two offices have been always held together, and the Chancellor sometimes acts in one capacity and sometimes in the other."
• (education) The head of a university, sometimes purely ceremonial.
  "When the extremely arduous duties of the Prime Minister’s [Robert Gascoyne-Cecil, 3rd Marquess of Salisbury’s] political life are considered, it will be understood that, if the Chancellorship of the University entailed any serious amount of work, it would have been impossible for him to continue in the office. As a matter of fact, this is not the case. There are Chancellor’s Prizes which he gives, but he does not present them in person. There is a Chancellor’s Court to which University men may be summoned, but it is invariably presided over by the Vice-Chancellor, who is, in fact, the one really executive authority. Sometimes the Chancellor heads deputations to Court, and sometimes (but rarely) he comes to [the University of] Oxford to preside over some special function, when his weighty words are greatly valued."
• (Scots law) The foreman of a jury.
  ""Have you agreed on your chancellor, gentlemen?" was the first question of the Judge. The foreman, called in Scotland the chancellor of the jury, usually the man of best rank and estimation among the assizers, stepped forward, and, with a low reverence, delivered to the Court a sealed paper, containing the verdict, […]"

noun

• (UK) Ellipsis of Chancellor of the Exchequer.