IPA: /ˌspɛʃəlaɪˈzeɪʃən/
KK: /ˌspɛʃəlaɪˈzeɪʃən/
A process of focusing on a specific area of study or work, often leading to expertise in that area.
Her specialisation in marine biology has allowed her to work on important conservation projects.
Specialisation → It is formed from "special" (from Latin "specialis", meaning particular or individual) and "-ation" (meaning the process of). The word "specialisation" refers to the process of becoming specialized or focusing on a particular area or skill.
Think of the word 'special' meaning particular, and remember that 'specialisation' is the process of becoming particularly skilled in something.