1) the paschal sacrifice (which was accustomed to be offered for the people's deliverance of old from Egypt)
2) the paschal lamb, i.e. the lamb the Israelites were accustomed to slay and eat on the fourteenth day of the month of Nisan (the first month of their year) in memory of the day on which their fathers, preparing to depart from Egypt, were bidden by God to slay and eat a lamb, and to sprinkle their door posts with its blood, that the destroying angel, seeing the blood, might pass over their dwellings; Christ crucified is likened to the slain paschal lamb
3) the paschal supper
4) the paschal feast, the feast of the Passover, extending from the 14th to the 20th day of the month Nisan
Part of Speech: noun neuter
Of Chaldee origin (compare [H6453]); the Passover (the meal, the day, the festival or the special sacrifices connected with it): - Easter, Passover.
|c Passover lamb||4.27|
|a Passover festival||51.6|
|b Passover meal||51.7|
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root πάσχα; click on the second column to search for that grammatical form of the root πάσχα; click on the third column to search for that word and grammatical form; click on the total to search for the root πάσχα.