primary

1. (political science) A primary election; a preliminary election to select a political candidate of a political party, or the first round of a two-round election.Examples: "In recent primaries, for example, nearly 4% of absentees were rejected in Philadelphia; 8% in Kentucky; and 20% in parts of New York City."; "Before Americans pick a president in November, they get to pick the candidates in a series of primaries and caucuses. […] Biden could still win New Hampshire’s primary through a write-in campaign, but the first sanctioned Democratic contest is in South Carolina in February."

2. (ornithology) Any flight feather attached to the manus (hand) of a bird.Examples: "`Good Lord, look at that swiftlet, it's got two primaries missing from its left wing!'"

3. (military) The first stage of a thermonuclear weapon, which sets off a fission explosion to help trigger a fusion reaction in the weapon's secondary stage.

4. (aviation) A radar return from an aircraft (or other object) produced solely by the reflection of the radar beam from the aircraft's skin, without additional information from the aircraft's transponder.

5. (medicine) The primary site of a disease; the original location or source of the disease.Examples: "unknown primary"; "most common primaries"

6. (electronics) A directly driven inductive coil, as in a transformer or induction motor that is magnetically coupled to a secondary.

1. (US, politics, transitive, intransitive) To challenge (an incumbent sitting politician) for their political party's nomination to run for re-election, through running a challenger campaign in a primary election, especially one that is more ideologically extreme.Examples: "In the New England town where he ran a “couple of night clubs” . he was “primarying the mayor.""; "What political facts of life underpin the hopes and dreams of democratic politicians who would take on the awesome task of “primarying” a two-term incumbent governor"; "Each of the past few election cycles has featured at least one instance of “primarying,” a challenge to an incumbent on the grounds that he or she is not sufficiently partisan."USintransitivetransitive

2. (US, intransitive, transitive) To take part in a primary election.Examples: "Both were worried that Bailey would break some of their delegate commitments to keep them from primarying."; "First, I'd challenge my opponent for the convention nomination. If I didn't prevail at the convention, that would be my answer. I wouldn't “primary” him—meaning, I wouldn't force a statewide primary election if he and I were the only two candidates in the field."; "“That’s the fun part - finding out who’s the unknown person who may want to primary to get one of the positions,” Kolenberg said."USintransitivetransitive