half-line

[haf-lahyn, hahf-]

half-line

[haf-lahyn, hahf-]
noun Mathematics.
ray (def. 7b).

Origin:
1910–15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Half-line is always a great word to know.
So is precalculus. Does it mean:
pertaining to the mathematical prerequisites for the study of calculus, as algebra, analytical geometry, and trigonometry
a relation of four quantities such that the first divided by the second is equal to the third divided by the fourth; the equality of ratios
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