dān​zǐdān​zi

monad

单子 (單子) dān​zǐ frequency
monad noun
a concept in philosophy or functional programming used to represent computations

In category theory, a monad is a very important concept.

only son noun
the only son of a family

He is the only son in the family and has been doted on by his parents since childhood.

单子 (單子) dān​zi
bedsheet noun
a piece of cloth used for covering a bed

He replaced the old sheets on the bed with new ones.

list noun
a document used for recording information, such as a list of items, a bill, or a form

The doctor gave me a medical test slip.

Frequency

Movie subtitles
11.8 per million appears in 3% of films
Written text
2.87 per million

Sources

Definitions
CC-CEDICT