I've just noticed that there is a colon in the pronunciation guide of the word 정리하다 as below.

정리하다 [정ː니하다]

What is the purpose of this colon? Does this mean we should make a pause when reading the word?


The ː symbol is the phonetic length mark indicating that the vowel in proceeding syllable is elongated.

For example listen to the difference between 눈 (eye) and 눈ː (snow). Notice how the 우 sound is longer in snow. This difference in length theoretically changes the meaning, but most speakers nowadays will say they actually pronounce these two the same.

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