Azan اذان Comes from the word Ezn اذن , meaning permission in Arabic, but is generally used as the term, call to prayer, and is not obligatory to perform before prayer.
AZAN
Takbiratul Ihram
Takbiratul ihram, or the statement of "Allahu Akbar" is the inaugural part of prayer. A prophetic hadith concludes:
"The moment takbiratul ihram is uttered, prayer enters a state of consecration."
We can start our prayer straight away with one " Allahu Akbar ", without saying the Azan.
Allah is greater than any description
Allahu Akbar - one time
اللهُ اَکبَرُ