en ‧ tail /ɪnˈteɪl/ BrE AmE verb [transitive]
[ Date: 1300-1400 ; Language: Anglo-French ; Origin: taile 'legal limitation' , from Old French taillier 'to cut, limit' ]
1 . to involve something as a necessary part or result:
A new computer system entails a lot of re-training.
Some foreign travel is entailed in the job.
entail doing something
The journey will entail changing trains twice.
2 . old use if you entail property, you arrange for it to be given to a specific person, usually your oldest son, when you die