Of one’s own free will, of one’s own volition.

(dated) A unit of luminous intensity of a light source, equal to 0.981 candelas.

(philosophy) A relation between incomplete and complete objects which seems to be very close to what is often called “instantiation”, i.e., a relation between universals and particulars. Incomplete...

Abbreviation of alternate. / Abbreviation of alternative, especially as a cultural phenomenon seen as being outside the mainstream of its genre.