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.
(..) What the hell do you mean, "dead end"? I mean, the whole landscape of false vacuums in string theory... ...could be as large as to the th power. In addition- Ooh, look, chocolate milk. I sense a disturbance in the force. A bad feeling I have about this. Mm. So how long have you been in America? (..)2008 TvShow: The Big Bang Theory Title: The Jerusalem Duality Season: 1 Episode 12