The Spanish word 'silla' (meaning 'chair') has its roots in the Latin language. It began with the Latin verb 'sedere' which meant 'to sit'. From this verb, the Latin noun '*sedla' meaning 'seat' was derived. This evolved into the Latin word 'sella' meaning 'chair'. As Latin evolved into Old Spanish, 'sella' became 'siella', and finally simplified to the modern Spanish 'silla'.

This evolution shows a clear pattern where the 'd' in '*sedla' was lost, and the remaining sounds gradually shifted to create the modern Spanish word. The meaning has remained remarkably stable throughout this evolution, always referring to something you sit on, specifically a chair.

Some related Spanish words include 'sedentario' (sedentary) and 'sentar' (to sit), which come from the same Latin root 'sedere'. Understanding this connection can help you remember that 'silla' is related to the concept of sitting.

English speakers might recognize the connection to words like 'sedentary', 'seat', and 'sit', which all share the same ancient root as 'silla'. The English word 'settle' is also related. All these words maintain a connection to the basic concept of sitting, making it easier to remember that 'silla' means 'chair' in Spanish.