Which Greek Lexicon are you using for the definition of baptizo?
Secondly, Jesus was baptized of John in the Jordan river, right? If Jesus had wanted John to pour water over Him, I’m sure there would have been a better location to perform this; say the Temple maybe?
What of the act of the Ethiopian eunuch; he would have used his water bottle I am sure instead of going down “into the water” with Philip. Oh, and he came up out of the water too.
It is true that *baptizo *often means immersion. For example, the Greek version of the Old Testament tells us that Naaman, at Elisha’s direction, “went down and
dipped himself [the Greek word here is *baptizo] seven times in the Jordan” (2 Kgs. 5:14,
Septuagint, emphasis added).
But immersion is not the only meaning of
baptizo. Sometimes it just means washing up. Thus Luke 11:38 reports that, when Jesus ate at a Pharisee’s house, “[t]he Pharisee was astonished to see that he did not first wash
baptizo] before dinner.” They did not practice immersion before dinner, but, according to Mark, the Pharisees “do not eat unless they wash
nipto] their hands, observing the tradition of the elders; and when they come from the market place, they do not eat unless they
wash themselves baptizo]” (Mark 7:3–4a, emphasis added). So
baptizo can mean cleansing or ritual washing as well as immersion.
A similar range of meanings can be seen when
baptizo is used metaphorically. Sometimes a figurative “baptism” is a sort of “immersion”; but not always. For example, speaking of his future suffering and death, Jesus said, “I have a baptism
baptisma] to be baptized
baptizo] with; and how I am constrained until it is accomplished!” (Luke 12:50) This might suggest that Christ would be “immersed” in suffering. On the other hand, consider the case of being “baptized with the Holy Spirit.”
In Acts 1:4–5 Jesus charged his disciples “not to depart from Jerusalem, but to wait for the promise of the Father, which, he said, ‘you heard from me, for John baptized with water, but before many days you shall be baptized with the Holy Spirit.’” Did this mean they would be “immersed” in the Spirit? No: three times Acts 2 states that the Holy Spirit was
poured out on them when Pentecost came (2:17, 18, 33, emphasis added). Later Peter referred to the Spirit
falling upon them, and also on others after Pentecost, explicitly identifying these events with the promise of being “baptized with the Holy Spirit” (Acts 11:15–17). These passages demonstrate that the meaning of
baptizo is broad enough to include “pouring.”
from
catholic.com/library/Baptism_Immersion_Only.asp