How you define flying in one sentence only ( short one not more than tree lines).
an instance of traveling by air!!!!
ok.. i will rephrase my question:
As a PILOT, how you define flying in one sentence only ( short one not more than tree lines).
Moving in the air with, or as with, wings; moving lightly or rapidly; intended for rapid movement.
thats what i understand from the question!!!!
i will try to find the small trick in the question capt.

Sorry guys as a pilot: flying is to have SITUATION AWARENESS in other words as a pilot you maintain a desired
1 - HEADING
2 - ALTITTUDE
3 - ATITTUDE (this include speed)
No tricks. I do not miss around when it comes to flying.
These three elements apply to birds too.. Don’t you think?
birds ??? yes you are right
1 - HEADING
2 - ALTITTUDE
3 - ATITTUDE