District of Columbia Code Division I. Government of District. § 1-301.45. Construction of terms set forth in acts and resolutions.

(1) Words importing the singular include and apply to several persons, parties, or things.

(2) Words importing the plural include the singular.

(3) With regard to resolutions, words importing 1 gender include and apply to the other gender as well.

(4) Words used in the present tense include the future as well as the present.

(5) The words “person” and “whoever” include corporations, companies, associations, firms, partnerships, societies, and joint stock companies, as well as individuals.

(6) “Officer” includes any person authorized by law to perform the duties of the office.

(7) “Signature” or “subscription” includes a mark when the person making it intended that mark as such.

(8) “Oath” includes affirmation, and “sworn” includes affirmed.

(9) “Writing” includes printing and typewriting and reproductions of visual symbols by photographing, multigraphing, mimeographing, manifolding, or otherwise.

(10) The words “include” and “including” mean “ includes, but not limited to” and “including, but not limited to”.

(11) Words such as “stepparent,” “stepmother,” “stepfather,” “ stepchild,” “stepsister,” and “stepbrother” are used to indicate a category of a family step-relationship created when an individual who is a parent of a child: