(automotive) A position in the four-stroke combustion process wherein the piston is at the topmost point in its stroke. This can either be during the compression phase or the combustion phase.

The quality or state of being insubordinate; disobedience to lawful authority; specifically, an employee's failure or refusal to comply with a request or an assignment given by his/her supervisor.

plural of pennate

(inorganic chemistry, in combination) Four arsenic atoms in a compound / (inorganic chemistry) The molecule that constitutes yellow arsenic. (As₄)