"I didn't know what was going on with my body, and why I was feeling that way", she testified.
Dickinson is one of five previous accusers called as witnesses to bolster the prosecution case in the intense and frequently dramatic first four days of Cosby's retrial.
Dickinson told jurors she wanted to include details about the assault, but wound up telling a highly sanitized version in which there was no sex at all, let alone a rape, because her publisher told her the legal department would never let the allegations against Cosby make it to print.
Dickinson then clashed with Cosby's defence attorney Tom Mesereau during his cross-examination, in an exchange which United States media outlets described as "heated".
The former model says she was 27 when Cosby invited her to Lake Tahoe to talk about how she could expand her career into singing and acting. The 80-year-old star has since pleaded not guilty to three charges of aggravated indecent assault.
That case ended in a mistrial when the jury became deadlocked.
The last-minute decision came after a judge unsealed civil court deposition testimony in which Cosby admitted he obtained seven prescriptions for Quaaludes in the 1970s so he could give the powerful drug to women he found sexually attractive. She was working as an administrator for the women's team, and she said he subsequently called her office and invited her to dinners at his houses in NY and CT. She told jurors Thursday she was "rendered motionless" by the pill as Cosby got on top of her in his Lake Tahoe, California, hotel room.
Actor and comedian Bill Cosby returns to the courtroom after lunch recess during the third day of the retrial of his sexual assault case at the Montgomery County Courthouse in Norristown, Pennsylvania on April 11, 2018. "And I said, 'No, I will not, I will fly first class'".
"I was kind of jolted awake and felt Mr Cosby on the couch beside me, behind me, and my vagina was being penetrated quite forcefully, and I felt my breast being touched", Constand said on the fifth day of Cosby's sexual assault retrial.
Later, Dickinson said, Cosby opened his robe and got on top of her. "It is a he said, she said, but what I think they're hoping in the current climate, you'll be prejudiced".
Bill Cosby center arrives for his sexual assault trial Thursday at the Montgomery County Courthouse in Norristown Pa
For the next 30 minutes Thursday at the Montgomery County Courthouse in Norristown, PA, the pair went back-and-forth in what has so far been the most contentious testimony of the Cosby retrial, with Mesereau attempting to show she lied for money and the exchange meandering into references about O.J. Simpson, lawyer Robert Shapiro and Sylvester Stallone.
Once at the hotel, she said she tested out her vocal range with Cosby's musical director, watched Cosby perform and then joined the two men for dinner at the hotel.
Following along because he was "America's Dad", Lublin said she lost consciousness after Cosby told her to sit between his knees and started petting her head.
"He raped me in Tahoe", Dickinson added. "It was a little round pill".
However, a third woman who also said she was abused by Cosby in 1989 only remembered after seeing a 2014 interview with Dickinson. "Slightly out of it".
Dickinson claimed she did not report the assault it would ruin her livelihood. Soon after, she said, Cosby pounced on her.
Cosby has said he gave Constand the cold medicine Benadryl and that she consented to sex.
Years later, in January 2015, after hearing accounts from other women, she said she realized "something else had happened after I blacked out".
Mesereau questioned her representation from lawyer Gloria Allred for media appearances. Cosby by no means agreed to that.
The supermodel continued, "I was feeling really lightheaded and it didn't sound like my words were coming out". According to The New York Times, Dickinson described what she remembered from that encounter to the jury, claiming that Cosby sexually assaulted her after giving her a pill that she believed to be for menstrual cramps.
Cosby spokesman Andrew Wyatt described the women as the supporting cast for chief accuser Andrea Constand.