Liftoff (noun)

1. The act or process of taking off or leaving the ground, especially in relation to a rocket or an aircraft.
2. The moment at which a rocket or an aircraft separates from the launch pad or the runway and begins to fly.

Origin:

From lift, meaning to raise or to raise up, and off, meaning to separate or to depart.

Examples:

1. The liftoff of the space shuttle was a spectacular sight, with the engines blazing and the rocket rising into the sky.
2. The liftoff of the first privately-funded manned spacecraft was a historic moment in space exploration.
3. The liftoff of the new commercial airliner was delayed due to technical issues.
4. The liftoff of the helicopter was hampered by the strong winds and turbulence.
5. The liftoff of the hot air balloon was a peaceful and serene experience, with the basket drifting gently into the sky.