electivus

Latin eligere combined e (out) and legere (to pick, to gather). To elect was to pick out from among a group — to select by deliberate choice rather than chance or assignment. The related legere also gave English lecture (a reading-aloud), legend (something to be read), and select (to pick out separately). Election and selecting shared the same Latin root because choosing and gathering were the same operation.

Medieval Latin electivus appeared in political and religious contexts: an elective monarchy was one in which the king was chosen rather than born to the role. The Holy Roman Emperor was an elective position — the Prince-Electors of the empire voted for each new emperor. The papacy was elective from its beginning: cardinals gathered in conclave to select the next pope.

The academic elective — a course chosen by the student rather than required by the curriculum — developed as university education became more structured in the 19th century. American universities, particularly Harvard under President Charles Eliot from the 1870s onward, developed the elective system: students could choose their own courses rather than following a fixed prescribed curriculum. Eliot's system was controversial; it remains the basis of American higher education.

Today elective appears in academic, medical, and political contexts. An elective course, elective surgery (chosen rather than emergency), and an elected official all share the Latin root. You choose it; it is not chosen for you. The act of picking out from among options is the constant.