casual worker means a worker engaged by the hour and who may be dismissed or leave the employer's service at any moment without notice and except as hereinafter provided shall not be engaged for more than 30 hours per week in ordinary hours.
contract worker means a natural person who is —
essential service means something basic; a commodity that is necessary, indispensable, or unavoidable and is purchased in a routine, repetitive, and noncompetitive manner.
The Contractor or Contractors means the firm, company or person engaged by the SBIIMS to carry out the work. It shall also include their legal representative(s), successors or assigns.
tidal work means so much of any work authorised by this Order as is on, under or over tidal waters or tidal lands below the level of high water;