"Ittisāl": the state of being connected and linked together. Original meaning: association, gathering. Opposite: disconnection, separation.
"Isnād": lifting something. It is derived from "sanad", which means a high place. "sunūd": attaching something to another. Other meanings: strengthening, assisting, conveying, protection.
"Takhrīj": revealing, making prominent. It is derived from "khurūj", which originally means: leaving. Other meanings: interpretation, clarification.
"Hadīth": spoken speech, something new. It is derived from "hadāthah", which means modernity. Opposite: old.
A Hadith that is narrated by Al-Bukhari and Muslim, who converge on the text and the Companion-narrator.
"Matn": everything that becomes apparent. It is derived from "matānah", which means hardness. Other meanings: word, origin, stay.
When a Hadith scholar judges a Hadith to be authentic for fulfilling the conditions of authenticity according to his personal reasoning.
Whoever lived before and after the coming of Islam and became a Muslim but did not see the Prophet, may Allah's peace and blessings be upon him.
Any saying, deed, implicit approval, state, or attribute that is ascribed to the Prophet, may Allah"s peace and blessings be upon him.
A Hadith with different, yet equally strong, narrations, so these narrations cannot be reconciled or weighed against each other.
A Hadith that has two or more successive narrators dropped form its chain of narrators.
A Hadith that is narrated by a trustworthier narrator in contradiction to a narrator who is less trustworthy.
Narrator who did not live during the Prophet's lifetime and narrated from the young Companions.
A Companion's statement or deed that evidence leads to the presumption that it originated from the Prophet, may Allah's peace and blessings be upon him, by way of inference.
A piece of news liable to be either true or false.
Judging that the narrators of a certain Hadith are the narrators accredited by Al-Bukhari and Muslim.