What is the definition of Masos"?
Rashi #2: 'Nisyonos' (tests).
Targum Onkelos and Targum Yonasan: 'Masos' (miracles).
What is the difference between "Osos and Mofsim"?
Rashi: "Osos" are signs, to prove that Moshe was Hashem's Shali'ach. "Mofsim" are wonders (or miracles), such as the ten Makos.
What are "Yad Chazakah" and "Zero'a Netuyah" referring to?
QUESTIONS ON RASHI
Rashi writes that "Zero'a Netuyah" refers to the sword of Makas Bechoros. What was that?
Bartenura: When Moshe announced Makas Bechoros, the Bechoros demanded that Pharaoh release Yisrael; he refused. They made war with the other Mitzriyim, and killed many. We learn from a Gezeirah Shavah to "v'Charbo Shelufah b'Yado Netuyah Al Yerushalayim" (Divrei ha'Yamim 1, 21:16). 1