IPA: /pərˈtɜːrbəˌneɪʃənl/
KK: /pərˈtɜr bəˌneɪ ʌl/
Relating to or caused by a disturbance or change in a system.
The scientists studied the perturbational effects on the climate model.
Perturbational → It is formed from "per-" (meaning through) and "turbare" (meaning to disturb or confuse), combined with the suffix "-ational" (indicating a relation to). The word "perturbational" refers to something that relates to the act of disturbing or causing confusion in a system or process.
Think of something that causes disturbance ('turbare') happening 'through' ('per-') a process, which helps you remember that 'perturbational' relates to disturbances in a system.