This is the 3607th most frequent French word.
lang
"Lang" is not a standalone word in French; it may be a truncation or typo. If you meant "langue," it translates to "language" or "tongue" in English.
Here, 'langue' refers to 'language' as a system of communication native to a particular group.
Cette langue est parlée par des millions de personnes.
This language is spoken by millions of people.
In this sentence, 'langue' means 'tongue', referring to the physical organ used in speech.
Il apprend à maîtriser sa langue pour mieux s'exprimer.
He learns to control his tongue to better express himself.
In this usage, 'langue' again refers to 'tongue', specifically in a medical context.