Are Islamic terms subject to change in their usage according to different countries, under the pretext of a certain usage being widespread?

Religious terminology is of two types:

1. That whose meaning has been clarified by the Lawgiver: Such as Islam and prayer. This does not require linguistic or customary interpretation. 2. That whose meaning has not been defined by the Lawgiver: In this case, recourse is made to custom, such as al-hirz (secure place/safeguard) and travel. This type varies according to different customs, times, and places.

Shaykh al-Islam Ibn Taymiyyah said: "If the meaning of religious terms is known from the Prophet (peace be upon him), they do not need the sayings of linguists. Names are of three types: those known by religious law (like prayer), those known by language (like the sun), and those known by custom (like al-qabd [seizure/possession] and al-ma'ruf [the good/known])."

Shaykh Ibn Uthaymeen said in his poetic composition: "And everything that came and was not defined by the Shariah, like al-hirz, define it by custom." He explained this by stating that whatever came unrestricted in the Qur'an and Sunnah (definition), its definition is referred to custom. This applies to many issues such as maintenance (nafaqah (definition)) and marital relations (mu'asharah), and rulings concerning travel such as the duration of stay and shortening prayers, wiping over the khuffayn (leather socks), and the secure place (hirz) for theft. This principle is beneficial in the chapter of transactions, unlike acts of worship, which require the permission of the Lawgiver.