👉 Notionalness is a concept in financial mathematics that refers to the value of a security or loan as it is actually outstanding. It's used to determine the price at which a security or loan can be bought or sold based on its perceived intrinsic value, rather than just its theoretical value. In simple terms, notionalness quantifies the actual amount of money that an investor has invested in a security or loan. This involves comparing the current market value of the securities or loans to their notional amounts