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one (number)
これは一です。
This is one.
Used as a standalone number or in counting.
first (ordinal number)
一位は田中さんです。
The first place is Mr. Tanaka.
When used as an ordinal number, it is often written as '第一' (daiichi).
Use 'いち' when counting in sequence, but 'ひとつ' when counting objects.
For ordinal numbers, use '第一' (daiichi) instead of 'いち'.
Derived from the Sino-Japanese numeral for 'one', originating from Middle Chinese.
In modern Japanese, 'いち' is often used in counting and numbering, while 'ひとつ' is more common for counting objects.