Meaning

• A primary election; a preliminary election to select a political candidate of a political party.

• The first year of grade school.

• A base or fundamental component; something that is irreducible.

• The most massive component of a gravitationally bound system, such as a planet in relation to its satellites.

• A primary school.

• Any flight feather attached to the manus (hand) of a bird.

• A primary colour.

• Primary site of disease; original location or source of the disease.

  "most common primaries"

• A directly driven inductive coil, as in a transformer or induction motor that is magnetically coupled to a secondary

Meaning

• To challenge (an incumbent sitting politician) for their political party's endorsement to run for re-election, through running a challenger campaign in a primary election, especially one that is more ideologically extreme.

• To take part in a primary election.

Meaning

• First or earliest in a group or series.

  "Children attend primary school, and teenagers attend secondary school."

• Main; principal; chief; placed ahead of others.

  "Preferred stock has primary claim on dividends, ahead of common stock."

• Earliest formed; fundamental.

• Illustrating, possessing, or characterized by, some quality or property in the first degree; having undergone the first stage of substitution or replacement.

• Relating to the place where a disorder or disease started to occur.

• Relating to day-to-day care provided by health professionals such as nurses, general practitioners, dentists etc.