principal ideal

noun Mathematics.

the smallest ideal containing a given element in a ring; an ideal in a ring with a multiplicative identity, obtained by multiplying each element of the ring by one specified element.

Origin:
1935–40

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Principal ideal is always a great word to know.

So is calculus. Does it mean:

one of several highly systematic methods of treating problems by a special system of algebraic notations, such as differential or integral calculus

a variable in a functional relation whose value determines the value or values of other variables, such as x in the relation y = 3x

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