Mean variance analysis is a component of modern portfolio theory, which assumes investors make rational decisions, and that for increased risk they expect a higher return. Next Up.
sitâ²-in`. 1. an organized passive protest against racial segregation in which the demonstrators occupy seats prohibited to them in public places. 2. any organized protest in which the demonstrators occupy and refuse to leave a public place.
Definition of in for Students. 1  1 : located or positioned within The house is in the country. 2  2 : into 1 We ran in the house. 3  3 : during It's warmer in the summer.  4 : with 2 I wrote in 1  pencil. 5 âused to show a state or condition You're in luck! We're in trouble.  6 âused to show manner or purpose I'm in a hurry. He laughed in reply.