Definition of "unexpired"

We were then in the third week of November; but, we took our measures so vigorously, and were so well seconded by the friends in whom we confided, that there was still a week of the month unexpired, when our party all came down together merrily, and mustered in the haunted house.

1859, Charles Dickens, The Haunted House

Regard must be had to the extent to which the original capital outlay has not been covered by the sum of the annual provisions for renewal, that is to say, in insurance terms, to the unexpired life of the original work, although this financial factor has to be modified in the light of the actual physical condition of the work to be replaced.

1945 March and April, T. F. Cameron, “New Works Procedure”, in Railway Magazine, page 72