IPA: /ˌmoʊtɪˈveɪʃənl/
KK: /moʊtɪˈveɪʃənl/
Something that encourages or inspires someone to take action or improve themselves.
The speaker gave a motivational talk that inspired everyone in the audience.
Motivational → It is formed from "motive" (from Latin "motivus", meaning causing motion) and the suffix "-ational" (meaning pertaining to). The word "motivational" refers to something that pertains to causing or inspiring motion or action.
Think of something that inspires action or movement — 'motive' means to cause motion, and '-ational' indicates it relates to that cause.