The term ''colorable imitation'' includes any mark which so resembles a registered mark as to be likely to cause confusion or mistake or to deceive. The phrase ''marks registered in the Patent and Trademark Office'' means registered marks. The term ''Act of March 3, 1881'', ''Act of February 20, 1905'', or ''Act of March 19, 1920'', means the respective Act as amended. A ''counterfeit'' is a spurious mark which is identical with, or substantially indistinguishable from, a registered mark. The term ''domain name'' means any alphanumeric designation which is registered with or assigned by any domain name registrar, domain name registry, or other domain name registration authority as part of an electronic address on the Internet.
Words used in the singular include the plural and vice versa.