Also this morning, the judge asked Cosby if he agreed with the defense's repeated requests for a mistrial - five in all, including four since delibedrations began.
In what could be a signal that jurors are nearing the end of their marathon deliberations, they asked for clarification of what "reasonable doubt" means.
The man once best known to United States audiences as "America's dad" faces similar accusations from dozens of women, though only Constand's allegations have resulted in criminal charges.
They also asked the court to read back more of Cosby's civil lawsuit deposition testimony - the third time they have sought to rehear his statements about his alleged assault against Andrea Constand almost 13 1/2 years ago.
Judge Steven T. O'Neill then read the definition, which included a doubt that would cause a "reasonable person" to "hesitate before acting on a matter of importance" as well as a doubt that was not "manufactured to avoid the carrying out of an unpleasant duty".
A hung jury would represent a clear victory for Cosby, who would avoid what could have been years in prison for three counts of aggravated indecent assault.
In the call, Gianna Constand said Cosby apologized and described himself as a "sick man". Constand says Cosby gave her pills in 2004 and sexually assaulted her.
"I do have evidence", she said. It was a tacit agreement Gonzales regretted until a friend expressed how sorry she was after hearing the story.
A woman heckled Cosby shouting "shame on you" as he walked into the building while supporters of the actor told her to "shut up" and welcomed him with his "hey, hey, hey" catchphrase from his 1970s and '80s "Fat Albert" cartoon. She said she awoke later to find Cosby sexually assaulting her on a couch, and said she felt "frozen" and unable to stop him.
After a lunch break, jurors are expected to rehear testimony from accuser Andrea Constand and her mother about phone calls with Cosby.
In Cosby's trial, jurors said Thursday they are deadlocked and can not come to a unanimous opinion on any of the three charges.
Bernard said she was drugged and assaulted by the comedian in the 1990s before he gave the actress a one-time role on "The Cosby Show".
"Despite the very compelling evidence I've saved and the witnesses who are willing to testify on my behalf, the prosecutor couldn't even consider pressing charges because of the statute of limitations on rape and sexual assault", she added.
O'Neill reread Cosby's deposition in which the comedian stated he would give women quaaludes when he wanted to have sex with them.
In the case of a mistrial, the Montgomery County, Pennsylvania, district attorney could choose to retry the case, but it's unlikely that prosecutors would move immediately for an retrial, according to a spokeswoman for the Montgomery County District Attorney's Office.
Defense attorneys said those were not the actions of a sexual assault victim, and suggested she was lying.
Commonwealth exhibits 27 through 43 comprise a wider portion of Cosby's deposition from more than a decade ago. His admissions in that deposition led Montgomery County prosecutors to file charges against him. Keshia Knight Pulliam, who played Rudy Huxtable on "The Cosby Show", escorted Cosby into court on the first day of the trial.