What is Acts Of Court?

Legal Definition
In courts of admiralty, by this phrase is understood legal memoranda of the nature of pleas. For example, the English court of admiralty disregards all tenders, except those formally made by acts of court. Abbott on Ship. pi. 3, c. 10, 2, p. 403; 4 Rob. R. 103; 1 Hagg. R. 157; Dunl. Adm. Pr. 104, 6.
-- Bouviers Law Dictionary
Legal Definition
Legal memoranda made in the admiralty courts in England, in the nature of pleas.
-- Black's Law Dictionary