cipher
noun
a secret method of writing or recording data, such as by substituting or adding letters or numbers, using specially formed symbols, or the like; code.
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The first thing Congress did in 1861 was to rescind the resolution of June 1, 1860, under which Mr. Floyd had been ciphering.
From Sketches New and Old, Part 2. by Twain, Mark