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Last week I saw the word 閾値 and when looking it up in Gjiten I see two
pronunciations, both marked as "popular":

  * 閾値 (いきち) (n) threshold (amount, dose, etc.); (P); 
  * 閾値 (しきいち) (n) threshold (amount, dose, etc.); (P); 

Which one should I use?  
In the context of professional discussion with colleagues and clients, if that
matters.
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pronunciation terminology mathematics
Pronunciation of 閾値 : いきち or しきいち?
I can't say I really know, but the koujien definition for しきいち just refers to
the いきち entry, so perhaps the latter is more common or correct?
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しきいち is the 湯桶読み (combination of 訓-Yomi & 音-Yomi, which is rare) of いきち
(音-Yomi only) according to kotobank.

  * しきい + チ (訓読み + 音読み)
  * イキ + チ (音読み + 音読み)

They shouldn't have any meaning/usage different, but I heard しきいち more often
though.
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(thanks to Ito's comment who pointed me in the right direction)

The characters 閾値 should read いきち as per their original pronunciation and is
used as is by major dictionary Daijirin.

しきいち is widely used because it's very close to the other word "敷居" (しきい) which
also means threshold.

Pronouncing しきい値 is thus grammatically considered a mistake although widely
used.

Key sentences:

> 「しきい値」は「敷居」から来た別の単語だが、現在は閾値を「しきいち」と読むのも誤用の定着として容認されつつある
>
> 「閾＝敷居」という意味・音声上の類似があることなどが、このような混乱を生じた原因と思われる

sources: <http://e-words.jp/w/E996BEE580A4.html>
<http://d.hatena.ne.jp/keyword/%A4%B7%A4%AD%A4%A4%C3%CD>
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> Which one should I use?

If you talk to a medical doctor, a psychologist, a biologist or a specialist
educated in a field related to medicine and life sciences, I think you should
use いきち. If you talk to an engineer, a natural scientist, a computer
scientist, or a specialist educated in science and engineering, I think しきいち
is more common. Those are their customs.

Wikipedia says "生理学や心理学では「閾値」が、物理学や工学では「しきい値」が、学術用語として定着している。"
<http://ja.wikipedia.org/wiki/%E3%81%97%E3%81%8D%E3%81%84%E5%80%A4>
slashdot.jp/journal/127124/%E9%96%BE%E5%80%A4
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