diction: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/diction - from package: diction

You may install the required package with command apt-get install {package}
Error in other languages:
diction: bevel nie gevind nie
diction: comandă negăsită
diction: comando não encontrado
diction: commande introuvable
diction: command not found
diction: käsku ei ole
diction: không tìm thấy lệnh
diction: komanda nerasta
diction: Kommando nicht gefunden.
diction: kommandot finns inte
diction: komut yok
diction: nie znaleziono polecenia
diction: níor aimsíodh an t-ordú
diction: no se encontró la orden
diction: no s'ha trobat l'ordre
diction: opdracht niet gevonden
diction: parancs nem található
diction: perintah tidak ditemukan
diction: príkaz nenájdený
diction: příkaz nenalezen
diction: команда не найдена
diction: командата не е открита
diction: 命令找不到
diction: コマンドが見つかりません