The Spanish word 'igualito' meaning 'exactly equal' or 'just the same' comes from combining the Spanish word 'igual' (equal) with the diminutive suffix '-ito'. The base word 'igual' traces back to the Latin word 'aequalis' meaning 'equal', which itself derives from the Latin root 'aequus' meaning 'level' or 'equal'. The addition of the diminutive '-ito' adds a sense of precision or exactness to the basic meaning of equality, as diminutives in Spanish can sometimes function to intensify or make meanings more precise.

The most obvious related Spanish word is 'igual' (equal, same), which is the base word of 'igualito'. Other common related words include 'igualdad' (equality), 'igualmente' (equally, likewise), and 'igualar' (to make equal, to match). All these words share the core meaning of equality or sameness derived from Latin 'aequalis'.

Several English words share the same Latin ancestor 'aequalis': 'equal', 'equality', 'equalize', and 'equation' all come from this source. The Latin root 'aequus' also gives us words like 'equitable' (fair, impartial) and 'equity' (fairness, justice). Notice how both the Spanish and English words maintain the basic concept of equality or fairness from their Latin origin.