1 part added to a building
ADJ. planned, proposed | home, kitchen | one-storey, two-storey, etc.
VERB + EXTENSION add, build
PREP. ~ to They're building an extension to their house.
2 extra time
ADJ. one-week, two-year, etc.
VERB + EXTENSION apply for, ask for, request He's applied for an extension of his visa. | get, receive She got an extension for writing her essay. | give sb, grant sb
3 making sth larger/taking sth further
ADJ. considerable, great, major, massive, significant | modest | further This new job is a further extension of his role as a manager. | general | gradual a gradual extension of the powers of central government | hair Hair extensions are pieces of artificial hair that are added to your hair to make it longer.
4 taking an argument/a situation further
ADJ. logical, natural, obvious The team appraisal is a logical extension of the individual appraisal interview.
PREP. by ~ The blame lies with the teachers and, by extension, with the Education Service.