Which dictionaries are they? I've never seen that. Here's the entry from the Cambridge Dictionary:
a type of work that you feel you are suited to doing and to which you should give all your time and energy, or the feeling that a type of work suits you in this way:
I feel I've found/missed my true vocation.
Most teachers regard their profession as a vocation, not just a job.
To work in medicine, you should have a vocation for it.
a type of work that you feel you are suited to doing and to which you should give all your time and energy, or the feeling that a type of work suits you in this way:
I feel I've found/missed my true vocation.
Most teachers regard their profession as a vocation, not just a job.
To work in medicine, you should have a vocation for it.
Synonym calling formal
Compare career noun
https://dictionary.cambridge.org/dictionary/english/vocation