What is the meaning of Aker?

Obsolete spelling of acre.

he-goat, billy goat

bucket

metal well bucket

kettle

acorn

acre

to steal

field (piece of arable land)

acre (land measure of 160 rods square (though actually varying in size, both regionally and in time), usually described as 40 rods/1 furlong long and 4 rods wide.)

field, cultivated land

field (wide, open space used to grow crops)

Shetland form of awkir

acre

Source: wiktionary.org