please define 'statement' in the glossary

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Page: https://www.postgresql.org/docs/17/glossary.html
Description:

Hello,
the glossary (https://www.postgresql.org/docs/current/glossary.html) does
not define 'statement' but a definition would be important to understand
other chapters such as this sentence: "statement_timestamp() returns the
start time of the current statement (more specifically, the time of receipt
of the latest command message from the client)." The sentence is from
https://www.postgresql.org/docs/17/functions-datetime.html#FUNCTIONS-DATETIME-CURRENT.
From the same page is this snippet: "start of current statement", in Table
9.33. Date/Time Functions.
It seems 'statement' can mean different things such as 'one operation, such
as a SELECT statement', but it can also mean 'all operations since the last
command message from the client, which can be several SELECTs'.
Thank you
Peter