un‧der‧sec‧re‧ta‧ry /ˌʌndəˈsekrətəri $ ˈʌndərˌsekrəteri/ noun (plural undersecretaries) [countable]

1. a very important official in a US government department who is one position in rank below the secretary

2. a minister in a British government department, who is one position in rank below the minister who is in charge of that department

3. a government official who is in charge of the daily work of a British government department

[TahlilGaran] Dictionary of Contemporary English ▲