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Singular

In English, singular usually means one.

In mathematics, a square matrix is called singular if it is not invertible.

In complex analysis, a singular point of a function f is a point such that f is analytic in its neighbourhood but not at it. See Mathematical singularity.

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... moving forward), and finally the liquids[?] and sibilants. (Note: The long vowels are held about twice as long as their short counterparts. Also, there exists a third, ...