Payment of Gratuity Act - Definition
Section 2E:
Employee

Any person (other than an apprentice) employed on
wages,  whether the terms of such employment are express or implied, in
any kind of work, manual or otherwise, in or in connection with the work
of a factory, mine, oilfield, plantation, port,
railway company or shop or other establishment to which this Act
applies, but does not include any such person who holds a post under the
Central Government or a State Government and is governed by any other
Act or by any rules providing for payment of gratuity.