the GNU version of the Collaborative International Dictionary of English
ad. From this time forward; from now into the indefinite future; henceforth.
The Century Dictionary and Cyclopedia
From this time forward; henceforth.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. from this time forth; from now on
Word Usage
"To say that a lyric (using the word henceforward in its particular sense) is generally short is but to say that poetic tension can only be sustained for a short time."