The Meaning of 'Aqidah'
The word 'aqidah' (عقيدة) is of the (morphological) form of (فعيلة) which has the meaning of (مفعول) (that to which something is done), meaning (معقودا عليه), that which is tied, knotted to, firmly fixed onto, held onto. It is derived from the root (عقد), which means to tie, fasten, join, bind.
The affairs of the religion are divided into akhbaar (information) and ahkaam (rulings that require action), as Allaah, the Mighty and Majestic, said:
وَتَمَّتْ كَلِمَتُ رَبِّكَ صِدْقًا وَعَدْلاً 
As for the akhbaar (information), then it is obligatory to accept and believe in them (make tasdeeq of them). Thus, anything that returns to belief (Eemaan) and acceptance (tasdeeq) and does not enter into the practical matters requiring action is called 'aqidah'. This is because its source and starting point is in the knowledge of the heart. It is called 'aqidah' because it enters the heart and it becomes fixed and tied to the heart strongly, meaning strongly bound and strongly adhered to it, in the sense that the heart is eager upon it so that it does not leave or escape from the heart.
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The word 'aqidah' (عقيدة) is of the (morphological) form of (فعيلة) which has the meaning of (مفعول) (that to which something is done), meaning (معقودا عليه), that which is tied, knotted to, firmly fixed onto, held onto. It is derived from the root (عقد), which means to tie, fasten, join, bind.
The affairs of the religion are divided into akhbaar (information) and ahkaam (rulings that require action), as Allaah, the Mighty and Majestic, said:
Allaah's word has been fulfilled in these two types: truthfulness in information and justice in His commands and prohibitions (ahkaam).And the Word of your Lord has been fulfilled in truth and in justice... (Al-An'am 6:115)
As for the akhbaar (information), then it is obligatory to accept and believe in them (make tasdeeq of them). Thus, anything that returns to belief (Eemaan) and acceptance (tasdeeq) and does not enter into the practical matters requiring action is called 'aqidah'. This is because its source and starting point is in the knowledge of the heart. It is called 'aqidah' because it enters the heart and it becomes fixed and tied to the heart strongly, meaning strongly bound and strongly adhered to it, in the sense that the heart is eager upon it so that it does not leave or escape from the heart.