What does "overspecialization" mean?

Extreme or excessive specialization.

How do you pronounce "overspecialization"?

Pronounced //ˌəʊvəˌspɛʃəlɪˈzeɪʃn̩//.

/ˌəʊvəˌspɛʃəlɪˈzeɪʃn̩/ noun

noun ·Rare ·Advanced level

Noun

From over- + specialization or overspecialize + -ation.