Breakdown of Il y a environ une centaine de clients.
une
a / an (feminine)
il y a
there is / there are
de
of / from / any (in negative sentences) / about (concerning)
le client
the client / the customer
Questions & Answers about Il y a environ une centaine de clients.
How is centaine formed and what does it mean?
Doesn't une centaine already mean "about a hundred"? Why add environ?
Why is it de clients instead of des clients?
Because une centaine acts as an expression of quantity. Just like with beaucoup de (a lot of) or un groupe de (a group of), these approximative nouns are always followed by the simple preposition de (or d' before a vowel), rather than des.