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one line; one stretch (e.g. of road); one strand (e.g. of hair); one beam (e.g. of light); one ray; one length (e.g. of rope)
earnest; resolute; intent; devoted; single-minded
「一条」 has another reading with different meanings.
暗闇の中を一条の光が窓から差し込んで床を照らした。
A single ray of light shone through the window and illuminated the floor in the darkness.
夜空に一条の流れ星が美しい弧を描いて消えていった。
A single shooting star drew a beautiful arc across the night sky and vanished.
遠くの灯台から一条の光が闇夜の海原を照らしていた。
A single beam of light from a distant lighthouse was illuminating the dark sea.