Origin: Latin suffix -ous
Spacious has 3 different meanings across 1 category:
Having plenty of space; roomy.
"The hotel suite was so spacious that we could easily spread out our luggage without feeling cramped."
In plain English: Spacious means having plenty of room so that you can move around easily without feeling crowded.
"The new apartment is very spacious, so we have plenty of room to move furniture around."
The word spacious comes from the Latin spatiōsus, meaning full of space or roomy. It traveled into English through Old French and later Middle English with this same core sense of having plenty of open area.