The city has the largest population in the country and 'in addition' [='also, additionally'] is a major shipping port.
an 'addition to' the family [=a new member of the family, such as a newborn baby]
The soup was thickened by the 'addition of' cream in the last stage of cooking.
(..) were minor or peripheral... ...until about six weeks ago. Then Roman World had a rise in breakdown rate... ...which doubled in a week. ln addition, we saw a disproportionate rise... ...in central as opposed to peripheral breakdowns. Now, we identified some problems with humidity control... (..)1973 Westworld