everyone, thanks for having me! So, i’ve just started studying kanji and
vocabulary and searching for words and readings on dictionaries (Japanese
app). However some cross information between my study platforms and
dictionaries are slightly different from each other and its quite confusing
for me to understand and set a pattern for how to read properly, for example;
In my studies i read that in 入り口 means entrance, therefore i would assume that
the reading of 入 would be い. In the dictionary says that 入り口 is the same as 入口
which would mean that the reading is in fact いり. I found that very confusing,
whats the reason to add り in between 入 and 口? What is the actual reading for 入
in this situation ? Also, in the Japanese dictionary, neither り or いり are
listed as kun’yomi or on’yomi readings, but instead i only found いり listed as
nanori reading, which i thought that was used only for names.
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question
kanji readings dictionary
Dictionary searching for kanji readings and words
This is a convention called "okurigana omission". See the following for
general discussions.

  * <https://en.wikipedia.org/wiki/Okurigana#Compounds>

> In compounds, okurigana may be omitted if there is no ambiguity in meaning
> or reading – in other words, if that compound is only read a single way. If
> okurigana occur after several characters (esp. both in the middle of the
> compound and at the end of the compound, as in 2-character compounds),
> either only the middle okurigana, or both the middle and the final okurigana
> may be omitted; omitting only the final okurigana but retaining the middle
> okurigana is rather unusual and somewhat questionable, though not unknown.

  * [Why can some words be written with or without okurigana? How do the uses differ?](https://japanese.stackexchange.com/q/6242/5010)
  * [有り難う vs 有難う — Is this the same word?](https://japanese.stackexchange.com/q/42093/5010)
  * [Is there a lingustic term for okurigana omission?](https://japanese.stackexchange.com/q/43055/5010)

The kanji 入 has multiple kun-readings, some of which are
[はい-る](https://jisho.org/word/%E5%85%A5%E3%82%8B-1),
[い-れる](https://jisho.org/word/%E5%85%A5%E3%82%8C%E3%82%8B) and
[い-る](https://jisho.org/word/%E5%85%A5%E3%82%8B) (the part after the hyphen is
okurigana). い-る is no longer used in everyday conversation except in fixed
phrases and compounds. い-り is not a dictionary form, so you see い-る instead.
Many words that start with い can be written with or without okurigana:

  * 入り口 = 入口  
entrance

  * 入り江 = 入江  
inlet; bay

  * 入れ墨 = 入墨  
tattoo

  * 入れ知恵 = 入知恵  
giving advice

(Note that how safe it is to drop okurigana depends on words. Although
understandable, it is usually wise to avoid 入墨 and 入知恵.)

However, in names, いり is used without okurigana. For example, 入江 (いりえ) is also
a common surname, and we never insert り between 入 and 江 (hiragana is rare in
family names). So in such cases, it's reasonable to think that 入 has an
intrinsic reading of いり. That's why いり (without okurigana) is listed as a
nanori reading.
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answer