adj

• (epidemiology) Of a disease: epidemic over a wide geographical area and affecting a large proportion of the population; also, of or pertaining to a disease of this nature.
  "The chaotic breakdown of public health as World War I dragged on is widely recognized as exacerbating the disease burden of the pandemic outbreak of influenza in 1918."
• (usually derogatory) General, widespread.
  "A former age insisted upon the efficacy of scarlet curtains and red broad-cloth in small-pox—a succeeding age thinks it has proved the practice superstitious,—or they refer to it fancy. Now that said fancy is an element in the constitution of man, possibly more powerful in its effects upon the cure or aggravation of disease, than all the drugs in all the chemists' laboratories in all the towns of the world. For it is universal and not partial, pandemic and not solitary."

noun

• (epidemiology) A pandemic disease; a disease that affects a wide geographical area and a large proportion of the population.
  "Those diseases which have some strong resemblance in their general characters, and attack many individuals in a large extent of country at about the same time, are commonly called epidemics. If all, or about all the inhabitants of a country be similarly attacked, at or near the same time, with a particular complaint, it is more properly called a pandemic."
• (by extension) The COVID-19 pandemic.

adj

• (Greek mythology, Roman mythology, rare) Alternative letter-case form of Pandemic (“of Aphrodite Pandemos, the earthly aspect of the Greek goddess of beauty and love Aphrodite and her Roman counterpart Venus, as contrasted with the heavenly aspect known as Aphrodite Urania: earthly, physical, sensual.”).
  "The meeting of Venus with Phoebe distinguishes her roles: the business of Venus in her pandemic form is to ensure the immortality of the kinds. Her Garden has the voluptuousness necessary to ensure this, and this is 'the first seminarie / Of all things that are borne to live and die / According to their kindes.' [Quoting from Edmund Spenser's The Faerie Queene.]"

adj

• (Greek mythology, Roman mythology) Of Aphrodite Pandemos, the earthly aspect of the Greek goddess of beauty and love Aphrodite and her Roman counterpart Venus, as contrasted with the heavenly aspect known as Aphrodite Urania: earthly, physical, sensual.
  "[page 64] The Love, therefore, which attends upon Venus Pandemos is, in truth, common to the vulgar, and presides over transient and fortuitous connexions, and is worshipped by the least excellent of mankind. The votaries of this deity seek the body rather than the soul, and the ignorant rather than the wise, disdaining all that is honourable and lovely, and considering how they shall best satisfy their sensual necessities. […] [page 67] That Pandemic lover who loves rather the body than the soul is worthless, nor can be constant and consistent, since he has placed his affections on that which has no stability."