一
yī HSK1

one

一 yī
one numeral
the number one, single, or used as an indefinite article

我买了一个苹果。

wǒ mǎi le yī gè píng​guǒ.

I bought an apple.

as soon as adverb
indicating that one action follows immediately after another

他一到家就开始做饭。

tā yī dào jiā jiù kāi​shǐ zuò​fàn.

He started cooking as soon as he got home.

whole numeral
entire, all, or throughout

他弄了一身泥。

tā nòng le yī shēn ní.

He got covered in mud.

radical numeral
the 'one' radical in Chinese characters (Kangxi radical 1)

老师告诉我们，这个汉字的部首是“一”。

lǎo​shī gào​su wǒ​men, zhè​ge hàn​zì de bù​shǒu shì“ yī”.

The teacher told us that the radical of this Chinese character is 'one'.

Frequency
Character
Written text
2nd most common 15765.7 per million
Movie subtitles
9th most common 12895.9 per million appears in 100% of films
Word
Movie subtitles
6070.0 per million appears in 100% of films

Details
HSK 2.0
Level 1
HSK 3.0
Level 1
Strokes
1
Unicode
U+4E00

Sources
Definitions
CC-CEDICT
Frequency data
MTSU Chinese text computingSUBTLEX-CH