The Spanish word 'igualada' comes from the verb 'igualar' meaning 'to make equal,' which itself derives from the Spanish adjective 'igual' (equal). The word 'igual' can be traced back to the Latin 'aequalis' meaning 'equal,' which comes from the Latin root 'aequus' meaning 'equal, level, or just.' The feminine past participle suffix '-ada' was added to 'igualar' to form 'igualada,' meaning 'equalized' or 'made equal.'

Some common related Spanish words include the basic adjective 'igual' (equal, same), which is much more frequently used than 'igualada'. You might also encounter 'igualdad' (equality) or the verb 'igualar' (to equalize, to match). All these words share the core meaning of equality or sameness from their Latin root.

English speakers might recognize the connection to words like 'equal,' 'equalize,' and 'equality,' which all come from the same Latin root 'aequus.' The English words maintained very similar meanings to their Spanish cousins, all dealing with concepts of sameness or fairness. Another related English word is 'equitable,' meaning fair or just, which also preserves the original Latin sense of justice or fairness.