- Characterized by either a complete response or by a total lack of response or effect, as in neurological action above a threshold.
all-or-none - Investment & Finance Definition
A type of buy or sell order placed with a broker to indicate it cannot be partially filled. The broker must fill the entire order or not fill it at all. Unlike a fill-or-kill order, an all-or-none order will not be automatically canceled if a broker can’t fill it fully right away.