(Greek mythology) The god of love and sexual desire; son of either Erebus and Nyx or Aphrodite and Ares. His Roman counterpart is Cupid. / 433 Eros, an asteroid

The process of finding a solution to a problem by trying many possible solutions and learning from mistakes until success is attained.

A mistake made during the process of typing, especially one caused by a slip of the fingers. / A mistake made during the process of typesetting.

(biology) The extinction of an organism (usually microorganisms) due to excessive RNA mutations.

(mathematics) The difference (sometimes defined to be the absolute difference) between the measured or inferred value of a quantity and its true value.

(chronology) The secular equivalent of anno Domini and the Christian Era, the internationally recognized method of numbering years on the Gregorian calendar.

Any fungus in the genus Claviceps which are parasitic on grasses.

(obsolete) First.

(obsolete) First of all, before (some other specified thing). / (obsolete) Sooner (than); before. / (archaic, poetic) Formerly, once, erstwhile.

(idiomatic) A foolish undertaking, especially one that is purposeless, fruitless, nonsensical, or certain to fail. / (idiomatic) Such an undertaking, assigned as a prank.