dictionary: command not found

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

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

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 CentOS possible default full paths are:

/var/spool/hylafax/bin/dictionary - from package: hylafax+

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/var/spool/hylafax/bin/dictionary - from package: hylafax-server

You may install the required package with command apt-get install {package}

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