ETYM French, from Latin primus first, a superl. corresponding to the compar. prior former. Related to Prior, Foremost, Former, Prim, Primary, Prince.
1. At the best stage.
2. (Math) Of or relating to or being an integer that cannot be factored into other integers.
Used of the first or originating agent.
1. To cover with a primer; apply a primer to; SYN. ground, undercoat.
2. To fill with priming liquid
3. To insert a primer into (a gun, mine, charge, etc.) preparatory to detonation or firing
4. Prayer service held at 6 a.m.