First opened Wednesday, November 9, 2005
一層
いっそう
Pitch accent: We don't have the data for this section. No accent list gives this spelling and reading, or the two we check against disagree.
much more, still more
Issō is 一 (ichi, “one”) plus 層 (sō, “layer”), shifted in pronunciation.
Taken apart
Select a part to see every word so far that is taken apart with it.
Wiktionary's text doesn't split this word, so each part is one of its kanji (with the okurigana written after it), with the reading and the dictionary meaning KANJIDIC2 gives that character — a word doesn't always use every sense of its kanji.
In a sentence
今日はいっそう寒い。
It is still colder today.
彼は事態を一層悪くした。
He added insult to injury.
Sentences are from Tatoeba (CC BY 2.0 FR), picked by fixed rules from a dated export and shown unchanged. Nobody has reviewed them one by one.
What Wiktionary says
Quoted line by line from Wiktionary's Etymology section for this reading, taken from one dated dump so it can't change underneath us. Nothing below is paraphrased.
- “Shift in pronunciation from 一層(いっそう) (issō).”
- “一(いち) (ichi, “one”) + 層(そう) (sō, “layer”)”
Source: Wiktionary: 一層 (dump of 2026-09-02), available under CC BY-SA 4.0. Reading, meaning and part of speech from JMdict, and kanji readings from KANJIDIC2 (EDRDG).
What the labels mean
- 漢語 Sino-Japanese
- Words built from Chinese-derived morphemes — borrowed from Chinese or coined in Japan out of Chinese parts — read with on'yomi.
- Compound
- Two or more words or stems joined into one.
- Rendaku
- The first sound of the second part voices when two native words join (kami → -gami).
- Sound change
- The pronunciation shifted over the centuries.