(chemistry) in aliphatic organic chemistry, a form of substitution reaction in which the leaving functional group is replaced with a nucleophile

(chemistry) in aromatic organic chemistry, a form of substitution reaction in which the leaving functional group (normally hydrogen) is replaced with an electrophile

(anatomy) A brain structure located in the mesencephalon (midbrain) that plays an important role in reward, addiction, and movement, damage to which occurs in Parkinson's and Parkinsonian patients.

A layer that lies underneath another. / (figuratively) The underlying cause or basis of something. / (linguistics) A substrate.

To survive on a minimum of resources. / (chiefly philosophy) To have ontological reality; to exist. / To retain a certain state; to continue.

Access to a resource for a period of time, generally for payment. / The formal acceptance of something, especially when verified with a signature. / The signing of one's name.

A person who subscribes to a publication or a service. / (programming) A system or component that subscribes to something, such as an event, made available by a publisher.

Financial support or assistance, such as a grant. / (dated) Money granted by parliament to the British Crown.

A document in which the party to a lawsuit states that his/her attorney of record is being substituted for by another attorney or by the party acting for himself/herself (in propria persona).

In a strong substantial manner; considerably. / To a great extent; in essence; essentially. / Without material qualifications.