IPA: /ˌæpəˈdɪktɪk/
KK: /ˌæpəˈdɪktɪk/
Something that is necessarily true and cannot be doubted or disputed.
The scientist presented an apodictic argument that left no room for doubt.
Apodictic is formed from "apo-" (meaning away from) and "dictus" (meaning said or declared). The term originally refers to something that is clearly established or beyond dispute, as if it has been definitively declared away from doubt.
Think of something that has been 'declared' ('dictus') in a way that leaves no room for doubt — that's what apodictic means.