O

oliguria total urine output less than 500 mL in 24 hours
open-end (mutual) fund  A fund that issues or redeems its own shares at their net asset value (NAV).

open self  That self that is known by others and by yourself.
organizational communication  The process of sending and receiving verbal and nonverbal messages that convey meaning and that occur within an organizational context.
over-the-counter market  An informal network of brokers and dealers who negotiate sales of securities (not a formal exchange).
overattribution  The process of attributing one’s behavior to one or a few particular characteristics. Avoid overattribution; rarely is any one factor an accurate explanation of complex human behavior.