primary

nouns

a preliminary election where delegates or nominees are chosen
primary, primary election
one of the main flight feathers projecting along the outer edge of a bird's wing
primary, primary feather, primary quill
(astronomy) a celestial body (especially a star) relative to other objects in orbit around it
primary
domain category
the branch of physics that studies celestial bodies and the universe as a whole
astronomy, uranology
is a type of (narrower)
natural objects visible in the sky
celestial body, heavenly body
coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit
"current through the primary coil induces current in the secondary coil"
primary, primary coil, primary winding

adjectives

of first rank or importance or value; direct and immediate rather than secondary
"primary goals"; "a primary effect"; "primary sources"; "a primary interest"
primary
antonym
secondary
is similar to
of primary importance
"our capital concern was to avoid defeat"
capital
is similar to
being an immediate result or consequence
"a direct result of the accident"
direct
is similar to
received directly from a source
"firsthand information"
firsthand
is similar to
being a regular member of a team
"first-string players"
first-string
is similar to
(of e.g. information) not secondhand or by way of something intermediary
"his work is based on only original, not secondary, sources"
original
is similar to
first and most important
"his special interest is music"; "she gets special (or particular) satisfaction from her volunteer work"
particular, special
see also
basic and fundamental
"the essential feature"
essential
see also
preceding all others in time or space or degree
"the first house on the right"; "the first day of spring"; "his first political race"; "her first baby"; "the first time"; "the first meetings of the new party"; "the first phase of his training"
first
see also
being or productive of something fresh and unusual; or being as first made or thought of
"a truly original approach"; "with original music"; "an original mind"
original
not derived from or reducible to something else; basic
"a primary instinct"
primary
is similar to
not derived; primary or simple
underived
most important element
"the chief aim of living"; "the main doors were of solid glass"; "the principal rivers of America"; "the principal example"; "policemen were primary targets"; "the master bedroom"; "a master switch"
chief, main, master, primary, principal
of or being the essential or basic part
"an elementary need for love and nurturing"
elemental, elementary, primary
of primary importance
basal, primary