So·thi·ac Soth·ic a. Of or pertaining to Sothis, the Egyptian name for the Dog Star; taking its name from the Dog Star; canicular.
 Sothiac year, or Sothic year Chronol., the Egyptian year of 365 days and 6 hours, as distinguished from the Egyptian vague year, which contained 365 days.  The Sothic period consists of 1,460 Sothic years, being equal to 1,461 vague years.  One of these periods ended in July, a. d. 139.

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 Vague a. [Compar. Vaguer superl. Vaguest.]
 1. Wandering; vagrant; vagabond. [Archaic] “To set upon the vague villains.”
    She danced along with vague, regardless eyes.   --Keats.
 2. Unsettled; unfixed; undetermined; indefinite; ambiguous; as, a vague idea; a vague proposition.
    This faith is neither a mere fantasy of future glory, nor a vague ebullition of feeling.   --I. Taylor.
    The poet turned away, and gave himself up to a sort of vague revery, which he called thought.   --Hawthorne.
 3. Proceeding from no known authority; unauthenticated; uncertain; flying; as, a vague report.
    Some legend strange and vague.   --Longfellow.
 Vague year. See Sothiac year, under Sothiac.
 Syn: -- Unsettled; indefinite; unfixed; ill-defined; ambiguous; hazy; loose; lax; uncertain.