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Meaning of balloon mail | Babel Free

Noun CEFR B2

Definitions

The transport of mail, usually for weight reasons, in the form of a postcard carrying the name of the sender by means of an unguided hydrogen or helium balloon.

uncountable

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
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See also

balloon modelling balloon net balloon payment balloon plant balloon release balloon sail

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