A partial verdict occurs when a judge permits a jury to return verdicts on fewer than all of the counts it has to decide, though it has not yet determined the remainder (and, it is possible, may never so determine). The verdicts the jury has reached may or may not be announced immediately.
A partial verdict happens when a judge allows a jury to find guilty on some charges but not all of them. This means they haven't finished deciding on the rest of the counts yet.  The jury might announce their findings right away, or they might wait until later.