Usage
In most contexts
till and
until have the same meaning and are interchangeable. The main difference is that
till is generally considered to be the more informal of the two, and occurs less frequently than until in writing.
Until also tends to be the natural choice at the beginning of a sentence:
until very recently, there was still a chance of rescuing the situation.
Interestingly, while it is commonly assumed that
till is an abbreviated form of
until (the spellings
‘till and
’ til reflect this),
till is in fact the earlier form.
Until appears to have been formed by the addition of Old Norse
und ‘as far as’ several hundred years after the date of the first records for
till. Source: online Oxford dictionaries