The Spanish word 'madurez' (meaning 'maturity') comes from combining the Spanish adjective 'maduro' (meaning 'mature') with the suffix '-ez', which is used to form abstract nouns from adjectives. The adjective 'maduro' itself derives from the Latin word 'maturus', meaning 'ripe' or 'mature'. The evolution from Latin 'maturus' to Spanish 'maduro' shows typical sound changes, where the 't' became 'd' between vowels (a process called lenition) and the ending was adapted to Spanish phonology.

The most obvious related Spanish word is 'maduro' (mature, ripe), which is simpler and more commonly encountered than 'madurez'. You might hear 'maduro' when talking about ripe fruit ('fruta madura') or a mature person ('una persona madura'). Another related word is the verb 'madurar' meaning 'to ripen' or 'to mature'.

English speakers might recognize the connection to the word 'mature', which comes from the same Latin root 'maturus'. The English words 'maturity', 'maturation', and 'premature' are all part of this word family. Notice how the English and Spanish terms maintained similar meanings related to ripeness and development, though English 'mature' preserved the 't' sound while Spanish 'maduro' developed a 'd' sound.