BUt you never should use the word takeoff in relation to aircraft unless it is to do with an actual real life clearance.
Even in multi crew briefs its frowned apon to use the word "takeoff" its always "after departure".
I know it may sound anal but the word takeoff is quite a major trigger word.
The reason why is multiple cockups when aircraft have departed when they wern't meant to just because they have half heard "takeoff" on the RT and presumed it was for them and gone.
And its not uncommon to get a local departure clearance eg "slowtp 332 after noise left heading 270 degrees".
The keeping "takeoff" special does work, it does trigger your ear for heightened SA. My heart rate does go up if I am in a dangerous position ie on the active and someone uses "takeoff" for example you are crossing a runway and you hear "takeoff" that could mean you have an aircraft coming towards you. The accident with the shorts in Paris is a prime example, if the pilots had heard cleared takeoff in english they might not have crossed the holding point onto the live runway.
The use of "departure clearance" instead of "takeoff clearance" is just a industry standard practise and one which I whole heartly agree with. I might add when I was a new FO on line I did think it was a bit anal. 3.5K hours later and in the LHS with a few ring twitchers behind me I am a bit anal about its miss use as well.