Before the chug of an engine could power a boat to safe harbor, sailing ships had to sit outside of port waiting for the right wind and tide conditions to carry them and their wares to their destination.
These conditions were called ob portu, Latin for 'into port.' The perfect mix of tide and wind conditions came to be called opportunity.
Real opportunity lies in all three'the port awaiting the goods, the capabilities and technologies that make those goods possible, and the weather and tides that bring them together. In times past, as well as today, opportunity for revenue is only realized when all three coincide.- Killing Ideas, Ch 3, Big Opportunity