1. Also called fixed investment trust, fixed trust. an investment company that has a fixed portfolio of securities, usually of a single type, such as municipal bonds or corporate bonds, which are held to maturity: each investor receives a share in the amount proportionate to his or her holding.
2. Also called u•ni•trustPronunciation: (yOO'ni-trust").[key]an inflexible type of mutual fund in which each investor is obligated to invest a total specified amount in a certain number of shares, payable in equal amounts on a monthly or quarterly basis over an extended period of time.
3. Brit.See mutual fund. Also called unit investment trust(for defs. 1, 2).