What is the meaning of -ij?

Forms abstract nouns denoting a state or concept related to the person(s) referred to by the stem; equivalent of -y

Forms nouns denoting a business or an organization which is run by the kind of person(s) referred to by the stem; equivalent of -ery

a suffix corresponding to English -ia, -y, -ion, -ius, -ium, etc.

forms imperatives of -ą stems

Source: wiktionary.org