(computing) The act of exploiting a security vulnerability on the same day it becomes publicly known.

(idiomatic) To appear; to be published or disseminated. / (idiomatic) To be realised.

plural of first order of the day

(politics) An item of business that will be discussed before any other item on a particular day when a legislature is sitting.

A bygone era of innocence and simplicity, especially youth

(journalism) A time when media organizations publish trivial stories due to the lack of more substantial topics.

plural of May-day sweep

plural of May Day sweep

(largely historical) One of the sweeps (chimney sweeps), clad in bright clothes and garlands and carrying a blackened broom, in a May Day parade.

Alternative form of May-day sweep