Meaning of “leaf” in the English Dictionary

"leaf" in British English

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leafnoun [ C ]

uk /liːf/ us /liːf/ plural leaves

leaf noun [ C ] (PLANT)

B1 one of the flat, usually green parts of a plant that are joined at one end to the stem or branch:

a palm leaf
autumn leaves
He was raking up leaves in his garden.
be in leaf/come into leaf

When a plant is in leaf or when it comes into leaf, it has or gets leaves on it:

The trees are in leaf early this year.
The bushes are just coming into leaf.

More examples

leaf noun [ C ] (PAPER)

a thin sheet of paper

leaf noun [ C ] (TABLE)

an extra part of a table that can be folded away when not being used

(Definition of “leaf” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"leaf" in American English

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leafnoun [ C ]

us /lif/ plural leaves /livz/

leaf noun [ C ] (PLANT)

any of the flat, usually green parts of a plant that are joined at one end to the stem or branch:

By early November it’s getting cold and the trees are starting to lose their leaves.

leaf noun [ C ] (PAPER)

a thin flat substance, esp. a sheet of paper, or a layer of something:

Some of the leaves of the old book had come loose.

A leaf of a table is an extra flat piece that can be added to the top surface to make the table larger.

(Definition of “leaf” from the Cambridge Academic Content Dictionary © Cambridge University Press)