introduction, presentation, referral
existing (between), interposition, intervention, involvement
trouble, burden, nuisance, bother, worry, care, dependence, support, kindness, obligation, staying (with a person)
mediation, agency, serving as a medium, acting as an intermediary, acting as a go-between, carrying (germs, diseases, etc.), transmission, mediation (in Hegelianism)
mere, only a ...
marine products, seafood, fish and shellfish