One of each halves of a pair of someone or something that belongs together. / A member of a business or law partnership.

(transitive) To join as a partner. / (intransitive, often with with) To work or perform as a partner.

(focus) Especially, extremely. / (degree) To a great extent. / Specifically, uniquely or individually. / In detail; with regard to particulars. / (dated) In a particular manner; fussily.

(obsolete) Pertaining only to a part of something; partial. / Specific; discrete; concrete. / Specialised; characteristic of a specific person or thing.

A small individual part of something larger; a detail, a point. / (obsolete) A person's own individual case.

A device that accelerates electrically charged particles to extremely high speeds, for the purpose of inducing high energy reactions or producing high energy radiation.

(physics) The concept applying to all matter and radiation, but most evident in light and particles such as the electron, that properties of waves and of particles are exhibited simultaneously

(physics) A positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity; α-particle

(astronomy, physics) A hypothetical class of particle, proposed to explain the dark matter problem.

existing as a part or portion; incomplete / (computer science) describing a property that holds only when an algorithm terminates