IPA: /pərˈmɪsɪv/
KK: /pərˈmɪsɪv/
Willing to allow or accept behavior, often in a way that is tolerant or lenient.
The permissive teacher allowed her students to choose their own projects.
Comparative: more permissive
Superlative: most permissive
Permissive → It is formed from "permittere" (meaning to allow) and the suffix "-ive" (meaning having the nature of). The word "permissive" means having the nature of allowing or granting permission.
Think of someone who is 'allowing' ('permittere') things to happen — that's why permissive means being open to letting things occur.