The meaning of al-ilah (god, deity)
God: &"He is Allah, other than whom there is no deity&" (Al-Hashr: 22).
The worshipped and obeyed Being who deserves to be worshipped and obeyed “Worship Allah and associate nothing with Him” (An-Nisâ&": 36).
The Meaning of "La ilaha illallah (There is no god but Allah)"
It means: there is no god that deserves to be worshipped but Allah
This statement is made-up of two main pillars
First: negating the true divinity of any god other than Allah (mighty and majestic is He)
Second: confirming the true divinity of Allah (mighty and majestic is He), which is designated only to Him
La ilaha illallah (there is no god but Allah): This is the statement of pure monotheism and the greatest obligation imposed by Allah on His slaves. This statement is to religion as the head is to the body.