The Spanish word 'humanidades' (meaning 'humanities') comes from the Latin word 'humanitas', which meant 'humanity' or 'human nature'. This Latin word first evolved into the Spanish singular form 'humanidad', and then the plural suffix '-es' was added to create 'humanidades', specifically referring to the academic disciplines that study human culture and society.

A simpler and more common related Spanish word is 'humanidad' (meaning 'humanity'), which is simply the singular form of 'humanidades'. While 'humanidad' refers to human nature or mankind in general, 'humanidades' specifically refers to the academic fields studying human culture. You might also encounter 'humano' (human) and 'humanizar' (to humanize), which share the same Latin root.

The English words 'humanity' and 'humanities' are perfect cognates with the Spanish 'humanidad' and 'humanidades', as they all derive from the same Latin root 'humanitas'. Just like in Spanish, the English word 'humanities' specifically refers to academic disciplines, while 'humanity' can refer to human nature or mankind as a whole. The similarity between these words makes them easy to remember for English speakers learning Spanish.