プログレッシブ和英中辞典(第4版)の解説
ざいしょく【在職】
山田氏は在職20年以上に及んでいる
Mr. Yamada has 「held office [been in office] for over twenty years.
在職中の検事
the incumbent public prosecutor／the public prosecutor currently in office
在職中に
during one's tenure of office／while one is [was] in office
在職期間
the period of one's service