next biggest, next dearest, etc adjective

Next lowest (or highest, depending on context) in degree after the previous one mentioned (also noun)

nextˈ-door adjective

1. Dwelling in, occupying or belonging to the next house, shop, etc
2. At or in the next house
3. Neighbouring
4. See also next door below

noun

The people or household living next door

next friend noun

A person appointed or permitted by a court of law to act on behalf of a minor or other person under legal disability

next Saturday, etc noun

1. (on) the first Saturday, etc after the present day
2. (in Scotland often) (on) the Saturday, etc of next week

next door

1. At or in the next house (often with to)
2. Near, bordering on, very nearly (with to)

next of kin see under kin¹

next to

1. Adjacent to
2. Almost
3. Thoroughly acquainted with (old US sl)

next to nothing

Almost nothing at all