The Spanish word 'aplauso' (meaning 'applause') comes from the Latin word 'applausus', which was derived from the verb 'applaudere' meaning 'to applaud'. The Latin 'applaudere' itself was formed by combining two elements: the prefix 'ad-' (meaning 'to, toward') and the verb 'plaudere' (meaning 'to clap'). When 'ad-' was added to words beginning with 'p-', the 'd' typically changed to 'p', giving us 'applaudere'. Over time, as Latin evolved into Spanish, 'applausus' became 'aplauso', following common sound changes between the languages.

A closely related Spanish word is the verb 'aplaudir' (to applaud), which comes from the same Latin root 'applaudere'. Both 'aplauso' and 'aplaudir' maintain their original meaning related to clapping and showing approval through applause.

The English words 'applause' and 'applaud' are direct cognates of Spanish 'aplauso' and 'aplaudir', as they also derive from the same Latin words 'applausus' and 'applaudere'. The meaning has remained remarkably consistent across both languages, making this an easy connection for English speakers to remember. Even the spelling is very similar - just remember that Spanish typically drops double consonants, so 'pp' becomes 'p'.