According to dictionary.com it is take-off if you mean it like an airplane taking off.
Correction
Takeoff and take off are both correct, but have different meanings. Takeoff is a noun, usually referring to something being launched or flying. Take off is a verb, and can refer to the process described in a takeoff, or it can refer to removing something. Some examples:
no it is not an one word it is of two word
I think the word "ongoing" is only one word, but it has two syllables that are two separate words.
It is one word.
one word
Toenail is one word.
It depends on the context.If a plane plans to take off, it is two words. The actual process, its takeoff is one word.If an item is a take-off (copy of another item) then it is hyphenated.
dribbling
There is the word, "Boost", and there is the word, "Blastoff", or "Takeoff", but no word to boost off, since that really doesn't mean anything.
Tell it to "HOLD FOR WAKE TURBULENCE". Wait two minutes, then issue clearance for takeoff.
dono dono
no it is not an one word it is of two word
I think the word "ongoing" is only one word, but it has two syllables that are two separate words.
One - Challenger.
One word, two syllables
It is one word.
one word
Takeoff - film - was created in 1979.