Thanks to prompting from @JeffG, I was able to find the source
tgz on gnu.org.
It would still be nice to be doing this from a package standpoint, but since it has not been updated since 2007, installing from source seems safe enough.
rpm -qip diction-1.11-4.fc12.i686.rpm
output from above command:
warning: diction-1.11-4.fc12.i686.rpm: V3 RSA/MD5 signature: NOKEY, key ID 97a1071f
Name : diction Relocations: (not relocatable)
Version : 1.11 Vendor: Fedora Project
Release : 4.fc12 Build Date: Sat Jul 25 07:30:33 2009
Install Date: (not installed) Build Host: x86-6.fedora.phx.redhat.com
Group : Applications/Text Source RPM: diction-1.11-4.fc12.src.rpm
Size : 187412 License: GPLv3+
Signature : RSA/8, Thu Jul 29 01:58:51 2010, Key ID 421caddb97a1071f
Packager : Fedora Project
URL : http://www.gnu.org/software/diction/diction.html
Summary : Identifies diction and style errors
Diction and style are two old standard UNIX commands. Diction identifies wordy
and commonly misused phrases. Style analyses surface characteristics of a
document, including sentence length and other readability measures.
These programs cannot help you structure a document well, but they can help to
avoid poor wording and compare the readability (not the understandability!) of
your documents with others. Both commands support English and German documents.