noun

1. An animal kept as a companion.

2. (by extension) Something kept as a companion, including inanimate objects. (pet rock, pet plant, etc.)

3. One who is excessively loyal to a superior.

Synonyms: companion animal

verb

1. To stroke or fondle (an animal).

2. To stroke or fondle (another person) amorously.

3. Of two or more people, to stroke and fondle one another amorously.

Synonyms: mope, pout, feel up, grope, touch up, pat, smooth, coddle

adjective

1. Favourite; cherished; the focus of one's (usually positive) attention.

   “The professor seemed offended by the criticism of her pet theory.”

2. Kept or treated as a pet.

   “pet rock”