There are 2 definitions of in-service in English:

in-service1

Syllabification: in-serv·ice

adjective

(Of training) intended for those actively engaged in the profession or activity concerned: in-service training of library staff
More example sentences
  • Shipanga said the successful bidders will be given in-service training.
  • Final year students are currently involved in 5 months of in-service training, he said.
  • But, he said, initial teacher training and in-service training should include advice and help on limiting voice strain problems.

Definition of in-service in:

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Word of the day epyllion
Pronunciation: ɪˈpɪlɪən
noun
a narrative poem resembling an epic in style...

There are 2 definitions of in-service in English:

in service2

1In or available for use.
More example sentences
  • It is not uncommon to have guns produced for America's previous wars in service today.
  • But it should be remembered that for the first two and a half years of the war they were far in advance of anything in service in any other nation.
  • The LCH class now has the distinction of being in commission longer than any other ship still in service.
2 dated Employed as a servant.
See parent entry: service

Definition of in-service in: