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...or, to phrase it differently, like one of those silly SAT questions... please help me fill in this blank:

4 is to 5 as "quadrant" is to ????

(Does that make sense?)

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What is a SAT question? Anyway, tell us the context where you would use the "5" instead of quadrant. – Alenanno Apr 8 '11 at 19:31
It makes sense that you would not be familiar with this, @Alenanno, but he's talking about the analogies section of the test formerly known as the Scholastic Aptitude Test (SAT I), that commonly used as a required entrance exam for entrance into university in the United States. – Uticensis Apr 8 '11 at 19:34
Yes-- what Billare said, exactly. The context is something like "Which quadrant of the map are you targeting?" -- except there's 5 sections of the map. – Eric Apr 9 '11 at 17:26
up vote 13 down vote accepted

Though a very rare word, that would be a quintant.

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I thought about it... OED says it's obsolete, no wonder I couldn't found it anywhere... :D – Alenanno Apr 8 '11 at 19:35
@Alenanno However obsolete, a quintant is a navigational device. Similar to a sextant or an octant, a quintant has a length that is 1/5 of a 360° circle, and is divided into five 72° sections. – HaL Apr 8 '11 at 19:45
Yes I "knew" it was the fifth part of a circle, when reading the "quadrant" definition, but I wasn't aware there a word for it... – Alenanno Apr 8 '11 at 23:14
Ah, I love rare words! Thanks Snumpy. – Eric Apr 9 '11 at 17:26

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