When the battery is completely empty and fully charged, we speak of a full charge cycle. We mostly speak of full charge cycles when the battery life is meant. Quite simply put - if we give a battery with a lifespan of 200 charging cycles, this means that the battery can either be charged approx. 200 times from completely empty to fully charged or approx. 400 times half empty to fully charged, or approx. 800 Times from 75% to 100%.
If a battery is fully charged again, even though it is only 50% empty, we speak of a "partial charge cycle".