(idiomatic) To change one's opinion, or be uneasy about a previous decision.

(law, chiefly US, Canada) The criminal offence of murder in a form defined as less serious than first-degree murder; the precise distinction may vary by jurisdiction but typically involves second-degree murder being intentional but not premeditated.

A system of units used in physics and other sciences, often abbreviated as mks. It is the basis of the SI system of international units.

(sciences) A system of units formerly used in physics (now replaced by the SI system), in which the basic units of length, mass and time were respectively centimeter, gram, and second.

plural of second-degree burn

(grammar) The form of a verb used with the pronouns thou and you (singular), or their equivalents in other languages.

(grammar) The form of a verb used with the pronouns you (plural), y'all, you guys, etc., or their equivalents in other languages.

a stream formed by the confluence of two first order streams, or of a first order stream and a second order stream

Of or relating to a measurement system that uses the foot as a measure of distance, the pound as a measure of force, and the second as a measure of time. Abbreviations: ft-lb-s, fps, f.p.s.

A unit of mechanical power, equal to that required to raise one pound through a distance of one foot in one second.