In the spirit of being helpful: “ignored” implies you knew the meaning and intentionally did not address it. I think you meant “I was unaware of this meaning” or “I didn’t know that.”
"I was ignorant of..." = I was unaware. "I was ignorant of the fact that the sun causes sunburn, and returned from the beach sunburned." (I didn't realize the sun would burn me.
This is a case of false friend when translating from french, where this meaning is the first one [2].
TIL!