Definition of September in US English:



  • The ninth month of the year, in the northern hemisphere usually considered the first month of autumn.

    ‘sow the plants in early September’
    as modifier ‘a warm September evening’
    • ‘Some of my most prized memories are of Septembers during my grade school and high school years, when the water was empty and warm, and the surf was firing because of the impending hurricane season.’
    • ‘The inquest was due to conclude last month but is now expected to run until at least September.’
    • ‘It is based on forms sent to properties across the district last August and September.’
    • ‘All staff have been fired with immediate effect and may not be paid for the month of September.’
    • ‘Now parents are ready to bring in new cabins and refurbish them in time for the September term.’
    • ‘The current target for the aggressive price drop is thought to be September of this year.’
    • ‘Cromwell defeated them at Dunbar and finally Worcester in successive Septembers, 1650 and 1651.’
    • ‘Come September, she says she will do her best to set up groups such as scouts and guides for the area.’
    • ‘The closure was announced in September but we voted on strikes over two months later.’
    • ‘In previous Septembers, we've described musicals that have still not materialized.’
    • ‘I'd have stuck it in a savings account and used it to fund a college course in September.’
    • ‘From September the plants start to enter dormancy so that by late October it is at a maximum.’
    • ‘Work on the bar starts soon and the refurbishment is due to be complete for a September opening.’
    • ‘Work is due to start in September and is expected to be completed by next April.’
    • ‘No date has yet been set for the protest, but it could take place in early September.’
    • ‘Work is already under way at the site and is due to be completed in time for the new school year in September.’
    • ‘He has probably had more bad Septembers than any other great player in history.’
    • ‘They had planned to get a house and start furnishing around September next year.’
    • ‘For its September concert this year the group has looked to a newer generation of musicals.’
    • ‘King hasn't set a date yet but expects it will be sometime in August or September.’


Late Old English, from Latin, from septem ‘seven’ (being originally the seventh month of the Roman year).