(uncountable) Any viscous liquid or paste, such as a lubricant, used in preparing a surface.

(uncountable) An absorbent material used to hold a liquid.

(uncountable, aeronautics) Any varnish used to coat a part, such as an airplane wing or a hot-air balloon in order to waterproof, strengthen, etc.

(uncountable, slang) A noun "dope" represents various recreational substances, particularly heroin and marijuana.

(uncountable, fireams) Ballistic data on previously fired rounds, used to calculate the required hold over a target.

(countable, slang) A stupid person.

(US, Ohio) Dessert topping.

(transitive, slang) To affect with drugs.

(transitive) To treat with dope (lubricant, etc.).

(transitive, electronics) To add a dopant such as arsenic to (a pure semiconductor such as silicon).

(intransitive, now chiefly sports) To use drugs; especially, to use prohibited performance-enhancing drugs (PEDs) in sporting competitions.

(slang) Amazing; cool.