Definitions of realize:

verb: convert into cash; of goods and property
verb: make real or concrete; give reality or substance to
verb: expand or complete (a thorough-based part in a piece of baroque music) by supplying the harmonies indicated in the figured bass
verb: perceive (an idea or situation) mentally
Example: "Does she realize how important this decision is?"
verb: be fully aware or cognizant of
verb: earn on some commercial or business transaction; earn as salary or wages