The exact point when a pregnancy becomes late-term, however, is not clearly defined. Some sources define an abortion after 16 weeks as "late".[7][8] Three articles published in 1998 in the same issue of the Journal of the American Medical Association could not agree on the definition. Two of the JAMA articles chose the 20th week of gestation to be the point where an abortion procedure would be considered late-term.[9] The third JAMA article chose the third trimester, or 27th week of gestation.[10]