(a) the expression "Director General " means the Director General of [Posts and Telegraphs];

(b) the expression "inland," used in relation to a postal article, means-

(c) the expression "mail bag " includes a bag, box, parcel or any other envelope or covering in which postal articles in course of transmission by post are conveyed, whether it does or does not contain any such article;

(d) the expression "mail ship " means a ship employed for carrying mails, pursuant to contract or continuing arrangement, by the Central Government or Her Majesty's Government or the Government of any British possession or foreign country;

(e) the expression "officer of the Post Office " includes any person employed in any business of the Post Office or on behalf of the Post Office;

(f) the expression "postage " means the duty chargeable for the transmission by post of postal articles;

(g) the expression "postage stamp " means any stamp provided by the Central Government for denoting postage or other fees or sums payable in respect of postal articles under this Act, and includes adhesive postage stamps and stamps printed, embossed, impressed or otherwise indicated on any envelope, wrapper, postcard or other article;

(h) the expression "post office " includes every house, building, room, carriage or place used for the purposes of the Post Office, and every letter-box provided by the Post Office for the reception of postal articles;

(i) the expression "postal article " includes a letter, postcard, newspaper, book, pattern or sample packet, parcel and every article or thing transmissible by post;

(j) the expression "Post Master General " includes a Deputy Post Master General or other officer exercising the powers of a Post Master General; and

(k) the expression "Post Office " means the department, [established for the purpose of carrying the provisions of this Act into effect and] [ Inserted by Act 14 of 1914, Section 3.] presided over by the Director General;