market order
noun[C]
STOCK MARKETukusaninstructionto abroker(= acompanythatbuysorsellssharesforinvestors)tobuyorsellparticularsharesat thebestpossibleprice:
Althoughplacingamarketorderguaranteesyourorderwill go through, thepriceyoupaymay notultimatelybe thepricequoted.