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Common mistake:
"insertae sedis" - people make a mixup with "to insert" or "insertion" and switch the C for an S.
The correct form is incertae sedis, both in the singular and in the plural.
Why?
sēdes, is -- Latin noun meaning "seat", gender feminine. As indicated in the standard dictionary entry, the singular genitive is sedis.
incertus, a, um -- Latin adjective meaning "uncertain". Flexed in the genitive feminine to match sedis makes incertae.
Thus incertae sedis, meaning "of uncertain seat".