sei

Sei is a term that appears in several languages and fields, with different meanings depending on context.

In Italian, sei is the second-person singular present of the verb essere, meaning you are, as in "tu sei felice."

In German, sei is the imperative form of sein used to tell someone to "be," as in "Sei ruhig!" It is also a present subjunctive form (Konjunktiv I) used in indirect speech, e.g., "Er sagt, er sei krank."

The sei whale, Balaenoptera borealis, is a large baleen whale found in cold oceans. It is one of several rorqual species and is known for its speed and deep diving abilities.

In Japanese, Sei is a common element in given names and can be represented by different kanji with meanings such as life or purity, depending on the characters chosen.

As an acronym, SEI typically stands for the Software Engineering Institute at Carnegie Mellon University, among other uses in different fields and organizations.

The meaning of sei is highly context-dependent, and no single definition covers all its uses.