Where does “amplíssimo” come from?

amplíssimo (Portuguese) comes from Portuguese amplo, from Latin amplus, from Latin -ō, from Proto-Indo-European -ō — Derives nouns from roots.

Ancestry of “amplíssimo”, step by step

StepLanguageWordMeaning
1Portugueseamploample, wide; spacious; abundant, abounding
2Latinampluslarge, spacious, roomy; abundant, ample;...
3Latin-ōsuffixed to nouns or adjectives. Originally a-stem nouns. Later extended to nouns with other stems. Forms regular first-conjugation verbs
4Proto-Indo-European-ōDerives nouns from roots
Every word from Proto-Indo-European -ō →Every word from Latin -ō →Every word from Latin amplus →