Absence of ideas.

plural of ideality

Having a specified style or number of ideas.

(law) The concept that no legal action can be instituted twice for the same cause.

(US, colloquial, often preceded by hey) Used to express surprise or dissatisfaction with an action or statement of another person, especially to that person.

plural of absolute idealism

(philosophy) A philosophy originally developed by certain German idealists such as Hegel and Schelling, which affirms that reality is grounded in cognition as a single, fundamental and unlimited principle of being that unites subject and object.

One's identity on an electronic or digital system such as the Internet.

A number used to confirm an individual's identity, e.g. when using an ATM or a mobile phone, or when making payment using a credit card or debit card.

(algebra, ring theory) A commutative ring in which every ideal is a principal ideal.