(uncountable) Satan; the Devil. / (by extension, countable) A particularly evil person. / Used other than figuratively or idiomatically: see prince, darkness.

(chemistry) lead acetate

Without any doubt or hesitation at all.

(aviation) The rate at which an aircraft gains altitude. A negative rate of climb implies descent.

(idiomatic, archaic) The worth of some trifling or insignificant matter; a whit or jot of value.

(mathematics) A line on a scatter plot that best defines or expresses the trend shown in the plotted points. It is chosen so that the sum of the squares of the distances from the points to the line is a minimum. It also illustrates the correlation (positive, negative, or zero correlation) between the plotted variables.

plural of course of action

The class of scale or magnitude of any amount, where each class contains values of a fixed ratio (most often 10) to the class preceding it. For example, something that is 2 orders of magnitude larger is 100 times larger, something that is 3 orders of magnitude larger is 1000 times larger, and something that is 6 orders of magnitude larger is a million times larger, because 10² = 100, 10³ = 1000, and 10⁶ = a million.

Of a projectile: missing the target. / (idiomatic) (Very) inaccurate.

(usually in the plural) The false belief that one is important or powerful, accompanying certain mental disorders. / (usually in the plural) Conceitedness or overconfidence.