Where does “oscitation” come from?

oscitation (English) comes from Latin oscitatio, from Latin ōscitō, from Latin citō, from Latin -tō, from Latin -tus, from Proto-Italic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

oscitation (English): The act of yawning or gaping. Also figuratively;...

Definitions

The act of yawning or gaping. Also figuratively;...

Ancestry of “oscitation”, step by step

Step	Language	Word	Meaning
1	Latin	oscitatio	—
2	Latin	ōscitō	to open one's mouth, gape
3	Latin	citō	quickly, fast
4	Latin	-tō	Forms here
5	Latin	-tus	Forms the past participle of verbs; Forms...
6	Proto-Italic	-tus	—
7	Proto-Indo-European	-tus	Derives action nouns from verb roots

Every word from Proto-Indo-European -tus →Every word from Latin -tus →Every word from Latin -tō →