"Let no one in any way deceive you, for it will not come unless
the apostasy comes first, and the man of lawlessness is revealed, the son of destruction"
Strong's Concordance
apostasia: defection, revolt
Original Word: ἀποστασία, ας, ἡ
Part of Speech: Noun, Feminine
Transliteration: apostasia
Phonetic Spelling: (ap-os-tas-ee'-ah)
Definition: defection, revolt
Usage: defection, apostasy, revolt.
HELPS Word-studies
646 apostasía (from
868 /aphístēmi, "leave, depart," which is derived from
575 /apó, "away from" and
2476 /histémi, "stand") – properly, departure (implying
desertion);
apostasy – literally, "a leaving, from a previous
standing."
The word apostasia is only used twice, once here and the other is in Acts 21:21
"Now they have been informed about you, that you teach all Jews among the Gentiles
apostasy from Moses, telling them not to circumcise the children nor to walk in the customs."
The word is used of turning away from, or leaving from a former standing.
If by chance you are looking at the word "apostasia" to mean departing up into the air, the word cannot be used in that way. I've debated on this belief many times where people take the English translation of "departure" and attempt to make it mean to depart up in the air. However, it cannot possibly be used in that way, because in these two scriptures, the definition would have to be a departure from the faith or in the case of Acts 21:21 apostacy from the law of Moses. It just can't be used to mean to depart up into the air, in case that is where you were going with this.
Blessings in Christ!