Is Othello a tragedy?

Othello is a tragedy because it meets the definition of tragedy in such standard authorities as Aristotle. Aristotle defined tragedy as a story about something that is "serious, complete, and of a certain magnitude" that uses drama to tell of the fall of someone highly placed. This fall occurs because of external or internal forces, especially the chief character's own "error or frailty," his or her "tragic flaw," and the drama ends with the attainment of understanding and a resolution of the fear and pity that it induces.
Othello fully satisfies this definition. Othello himself is a high, admirable character whose downfall arouses pity and fear. He and the other characters in the play are true to life, consistent, and behave logically according to the information they are supposed to have. Their characteristics support the plot -- Othello is jealous (his "tragic flaw") and trusting, Desdemona loving and faithful, Iago evil and devious, plotting the ruin of his supposed master Othello. Othello is brought down due to an external force (the hatred of Iago) working in harmony with his own jealousy, his tragic flaw, to end in his destruction and that of his wife, an equally admirable character. The incidents of the plot arouse pity and fear in the viewers; the situtuation (betrayal by a trusted associate) is universal, and so viewers can envisage themselves tricked in the way Othello is tricked. Finally, the play ends with a katharsis or "purging," a resolution of the pity and fear we feel at seeing Othello tricked into murdering his wife, as Iago is discovered and condemned and Othello fully understands what has been done to him and commits suicide.