Meaning of when-issued

when-is•sued

Pronunciation: (hwen-ish'd, wen-, hwun-, wun- or, esp. Brit., -is'yd), [key]
— adj.
  1. of, pertaining to, or noting an agreement to buy securities paid for at the time of delivery. Abbr.: wi, w.i.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.