what were the possibly meanings of ending the war in the pacific?

Answer 1

If you mean what were possible means to end the war, without dropping the A-bombs........

wait for the Russians to shift their forces 6,000 miles to the east and invade with them dividing up Japan the way Germany was being divided.

Continue the naval blockade of the Home Islands of Japan. leaving a million Japanese troops in Korea and China and Vietnam and Burma and ( today's) Indonesia....and leaving 20,000 American and 20,000 Brits and Australians in Japanese prison camps that made Auschwitz look like Club Med.....

Invade the Home Islands.....

When we liberated Guam and Saipan Islands, the Japanese
troops refused to surrender. All we could do was kill them all. The Japanese civilians on the islands also preferred death to surrender, and thousands of women killed their kids and them themselves rather than be taken prisoner.

When we captured Okinawa island, thousands of Japanese planes....the Kamikazes...flew one way missions form Japan to crash our ships. The Navy lost 4 times as many men and ships at Okinawa as we had at Pearl Harbor.
Gen Douglas MacArthur who knew the Japanese better than anyone, and who had lost less than a third of the numbers Ike had lost in Europe, predicted 1,000,000 Allied soldiers and sailors.....and we had only lost about 100,000 so far....dead or wounded. and probably 20,000,000 dead Japanese, including just about every man between 15 and 60.

or continue the B-29 fire bomb raids......2 months before Hiroshima, a thousand B-29s burned most of Tokyo to the ground and killed far more than in either A bomb strike. That wouldnt have solved the million Japs overseas or the conquered territory they held.