To initiate or begin some action. / To attack.

(transitive) To state; describe; give an account of. / (transitive) To present for consideration; to propose. / (intransitive) To begin a journey or expedition. / (intransitive) To start.

(mathematics) The mathematical theory of sets. / (music) Musical set theory, a systematic approach to describing musical objects and their relationships.

A screw with threads along the entire length and no head. Typically, set screws have a hex or slot drive recessed in the threaded length; a grub screw or worm screw.

In a position to function; ready.

(transitive) To ready for use. / (transitive) To arrange logically. / (transitive) To cause to happen. / (transitive) To trap or ensnare. / (transitive) To arrange for an outcome; to tamper or rig.

(mathematics, set theory, measure theory) A set that is small enough that it can be ignored for some purpose.

(transitive) To separate and reserve something for a specific purpose. / (transitive) To leave out of account; to omit or neglect. / (transitive) To disagree with something and reject or overturn it.

(idiomatic) Permanent; certain; firm.

(mathematics) the set of complex numbers c for which the orbit of 0 under iteration of the complex quadratic polynomial zₙ₊₁ = zₙ² + c remains bounded. The boundary of this set is a fractal.