The Boston Celtics had their best record in a season in 1972-73, with a record of 68-14.

what was the best record in a season for the celtics
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Boston CelticsBoston Celtics1972-738268-14.829240.6112.758.628.346.5103.844.819.725.378.019,7309,2384,8022,3201,805
Boston CelticsBoston Celtics1985-868267-15.817242.1114.146.429.17.86.216.645.389.250.81.74.835.121.827.479.419,8559,3593,8072,3876415111,3601,756
Boston CelticsBoston Celtics2007-088266-16.805240.9100.542.022.48.54.615.236.476.747.57.319.138.120.526.577.119,7558,2453,4451,8336963791,2461,864
Boston CelticsBoston Celtics1959-607559-16.787241.0124.580.224.749.9119.641.724.733.673.418,0759,3376,0141,8491,856
Boston CelticsBoston Celtics1964-658062-18.775240.9112.871.922.244.6107.641.423.632.373.119,2759,0245,7481,7722,065
Boston CelticsBoston Celtics1984-858263-19.768240.3114.845.727.97.95.016.245.489.350.81.33.835.622.728.180.619,7059,4123,7462,2876454141,3321,781
Boston CelticsBoston Celtics1981-828263-19.768241.2112.045.625.98.06.917.744.689.449.90.62.226.622.230.074.019,7809,1803,7422,1266525681,4522,014
Boston CelticsBoston Celtics2008-098262-20.756242.4100.942.122.77.64.715.637.577.248.66.616.539.719.425.376.519,8808,2753,4551,8626213871,2801,897
Boston CelticsBoston Celtics1983-848262-20.756243.4112.145.125.98.25.217.344.188.250.00.72.824.023.329.479.219,9559,1943,6972,1226734301,4201,949
Boston CelticsBoston Celtics1980-818262-20.756241.2109.943.626.98.37.219.243.786.650.40.82.927.021.728.975.219,7809,0083,5792,2026835941,5771,990
Boston CelticsBoston Celtics1961-628060-20.750240.9121.176.025.648.2113.942.324.733.972.819,2759,6876,0802,0491,909
Boston CelticsBoston Celtics1979-808261-21.744242.4113.544.926.89.93.818.844.190.149.02.05.138.423.329.977.919,8809,3033,6842,1988093081,5391,974
Boston CelticsBoston Celtics1966-678160-21.741242.2119.370.424.246.0102.844.727.436.674.819,6159,6645,7031,9622,138
Boston CelticsBoston Celtics1963-648059-21.738240.9113.071.722.045.2109.641.322.631.172.519,2759,0425,7361,7602,125
Boston CelticsBoston Celtics1974-758260-22.732240.9106.552.026.38.13.519.843.795.445.819.024.079.119,7558,7344,2642,1596622881,6251,913
Boston CelticsBoston Celtics1962-638058-22.725240.9118.872.724.546.8109.742.725.234.772.519,2759,5045,8181,9602,090
Boston CelticsBoston Celtics1958-597252-20.722242.8116.477.821.844.6112.739.527.335.676.617,4808,3795,6011,5681,769
Boston CelticsBoston Celtics1960-617957-22.722241.3119.777.623.746.8117.739.826.135.673.319,0609,4606,1311,8722,032
Boston CelticsBoston Celtics1986-878259-23.720241.5112.642.929.56.86.415.944.586.051.72.56.936.621.226.380.819,8059,2373,5182,4215615261,3001,710
Boston CelticsBoston Celtics1987-888257-25.695241.2113.641.129.97.65.115.943.984.252.13.38.638.422.528.080.319,7809,3153,3702,4486204151,3041,804
Boston CelticsBoston Celtics2010-118256-26.683241.296.538.823.48.24.214.636.975.848.65.013.636.517.823.177.019,7807,9133,1811,9216763441,1951,678
Boston CelticsBoston Celtics1990-918256-26.683241.5111.546.226.38.26.916.145.188.051.21.34.231.520.124.482.419,8059,1453,7852,1606725651,3201,695
Boston CelticsBoston Celtics1982-838256-26.683241.8112.146.427.09.66.418.845.392.049.20.52.321.021.128.673.719,8309,1913,8052,2167895211,5412,062
Boston CelticsBoston Celtics1973-748256-26.683241.2109.054.326.76.83.721.944.397.245.620.525.680.019,7808,9374,4522,1875613051,7961,868
Boston CelticsBoston Celtics1971-728256-26.683240.6115.654.427.246.6102.845.322.428.977.719,7309,4774,4622,2302,030
Boston CelticsBoston Celtics1957-587249-23.681240.3109.975.020.941.8107.838.726.435.973.717,3057,9165,4021,5081,723
Boston CelticsBoston Celtics1965-668054-26.675240.3112.769.922.443.6104.641.725.534.573.919,2259,0145,5911,7952,012
Boston CelticsBoston Celtics2017-188255-27.671241.5104.044.522.57.44.514.038.385.145.011.530.437.716.020.777.119,8058,5293,6451,8426043731,1491,618
Boston CelticsBoston Celtics2019-207248-24.667242.1113.746.123.08.35.613.841.389.646.112.634.536.418.623.280.117,4308,1833,3171,6555954069951,553
Boston CelticsBoston Celtics1975-768254-28.659240.9106.252.924.16.83.219.643.096.444.620.225.978.019,7558,7084,3411,9805612601,6092,002