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single word requests - Double is to triple as halve is to ...?


"Divide by three" is the only way I know to say this but I'm looking for a single word, if one exists.



Answer



The OED defines third, verb, as such:



To divide (anything) into three equal parts; to reduce to one third of the number or bulk.



and it gives an example from 1874:



Such a course would have halved or thirded the number of our subscribers.



However, as choster pointed out in a comment, this seems to be rare.


I did an ngrams search which shows the relative changes in halved, thirded over time, and the usage of halved has increased while the usage of thirded has decreased. Similarly, the usage of thrice is also decreasing over time. This suggests to me that you should avoid using the word "thirded" despite it being a recognized usage.


Another answer provides the word "trisect". This word doesn't fit precisely in the collection "quartered, X, halved", but rather goes with "bisect, trisect, quadrisect". These words seem to me to be more technical in nature, used for geometry (e.g. Trisecting the Angle) or other mathematical or scientific contexts. Also, trisect can only be used for the sense "to cut into three equal parts" and not in the sense "to reduce to one third the size".


Interestingly halved is more popular than bisected but tristected is more popular than thirded.


Tl;dr:



  • If you want to fill the "quartered, halved, etc" group, use thirded.

  • If you want language people actually use, just say "cut into thirds" or "divided into three" or something similar.

  • If you need a current, single word, trisected is probably your best bet but it doesn't really fit the pattern nor satisfy all the meanings.


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