Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
appdata()
appdata(org.gnome.Dictionary.appdata.xml)
application()
application(org.gnome.Dictionary.desktop)
gnome-dictionary
gnome-dictionary(x86-64)

Requires :

libgdk-3.so.0()(64bit)
libc.so.6()(64bit)
libcairo-gobject.so.2()(64bit)
gnome-dictionary-libs(x86-64) = 3.20.0-1.el7
libc.so.6(GLIBC_2.2.5)(64bit)
/bin/sh
rtld(GNU_HASH)
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
libpthread.so.0(GLIBC_2.2.5)(64bit)
libpthread.so.0()(64bit)
libgtk-3.so.0()(64bit)
libgio-2.0.so.0()(64bit)
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
libm.so.6(GLIBC_2.2.5)(64bit)
libpangocairo-1.0.so.0()(64bit)
libcairo.so.2()(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libgdk_pixbuf-2.0.so.0()(64bit)
libglib-2.0.so.0()(64bit)
libm.so.6()(64bit)
rpmlib(PayloadIsXz) <= 5.2-1
libgdict-1.0.so.10()(64bit)
libatk-1.0.so.0()(64bit)
libpango-1.0.so.0()(64bit)
libgobject-2.0.so.0()(64bit)

Content of RPM :
/usr/bin/gnome-dictionary
/usr/share/appdata/org.gnome.Dictionary.appdata.xml
/usr/share/applications/org.gnome.Dictionary.desktop
/usr/share/dbus-1/services/org.gnome.Dictionary.service
/usr/share/doc/gnome-dictionary-3.20.0
/usr/share/doc/gnome-dictionary-3.20.0/AUTHORS
/usr/share/doc/gnome-dictionary-3.20.0/NEWS
/usr/share/doc/gnome-dictionary-3.20.0/README
/usr/share/glib-2.0/schemas/org.gnome.dictionary.gschema.xml
/usr/share/licenses/gnome-dictionary-3.20.0
/usr/share/licenses/gnome-dictionary-3.20.0/COPYING
/usr/share/licenses/gnome-dictionary-3.20.0/COPYING.docs
/usr/share/licenses/gnome-dictionary-3.20.0/COPYING.libs
/usr/share/man/man1/gnome-dictionary.1.gz