D.C. Code § 45-602
Words importing the singular number shall be held to include the plural, and vice versa, except where such construction would be unreasonable.
Mar. 3, 1901, 31 Stat. 1189, ch. 854
1973 Ed., § 49-202.
1981 Ed., § 49-202.
Acts and resolutions of Council, rules of construction, see § 1-301.45 et seq.