The act of baptizing; the application of water to a person, as a sacrament or religious ceremony, by which he is initiated into the visible church of Christ. This is performed by immersion, sprinkling, or pouring.
it refers to the biblical first baptism
That is true.
The Greek name for baptism is "βάπτισμα" (baptisma), which derives from the verb "βαπτίζω" (baptizo), meaning "to immerse" or "to dip." In the context of Christian practices, it refers to the ritual of initiation and purification through water. Baptism holds significant importance in the Christian faith as a symbol of spiritual rebirth and entry into the community of believers.
No.
Baptism comes from the Greek noun baptisma which is derived from baptismos, meaning "washing." So baptism does not specifically mean 'to submerge' but, rather, 'washing'.
no
to pour water on the people
No, baptism is a concrete noun. It refers to the physical act of immersing someone in water or sprinkling water on them as a religious ritual.
True it refers to that, while the meaning of the phrase is usually metaphorical and not limited to weather.
Baptism of blood refers to martyrdom. A person who through no fault of their own has not been baptized but dies for the Faith will be saved anyway.
no but it wouldn't be a bad idea to get baptized.
Shiloh (????) refers to an ancient city, but it's true meaning is unknown. Rabbi Shlomo Yitzkhaki (????) suggested it was actually two Hebrew words meaning "tribute to him".