SEI definitions

Sei

1) Balaenoptera borealis 2) Blue whale relative 3) Cinque e uno 4) Cinque follower 5) Die on one side of Italy 6) Due + quattro 7) Due three times 8) Due times tre 9) Due tripled 10) Due x tre 11) Endangered baleen whale 12) Endangered whale 13) Fast-swimming whale 14) Finback whale 15) Half of dodici
Found on https://www.crosswordclues.com/clue/sei

---

SEI

Abbreviation for a US scrapbooking company.
Found on http://www.encyclo.co.uk/local/20484

---

SEI

Software Engineering Institute
Found on http://www.translationdirectory.com/glossaries/glossary117.htm

---