noun
whole surface; entire area; all over
Describes something covering or spreading across an entire surface or area. Often used with に to mean 'all over'.
雪が一面に積もった。
Snow covered the whole area.
壁一面にポスターが貼ってある。
Posters are plastered all over the wall.
noun
one aspect; one side
Refers to a single facet or perspective of something, often contrasted with other aspects.
彼の話は一面の真実しか伝えていない。
His story conveys only one side of the truth.
noun, adverb
Used in the pattern 一面では or 一面において to introduce a contrasting viewpoint. More formal than 一方.
彼は一面では優しいが、一面では厳しい。
On the one hand he is kind, but on the other hand he is strict.
noun
one flat object; one sheet
Counter-like usage for a single broad, flat item such as a mirror, board, or sheet of paper. Often used in compounds.
鏡を一面買った。
I bought one mirror.
noun
Specifically the front page of a newspaper or magazine. The numeral form １面 is common in this context.
その事件は一面トップで報じられた。
The incident was reported as the top story on the front page.
全面 means 'entire surface' or 'all sides', often used for physical surfaces or comprehensive coverage, while 一面 emphasizes a single continuous expanse or one aspect.
一方 is the common word for 'on the other hand' in everyday speech; 一面 is more formal and often used in written or structured arguments.
Compound of 一 (one) and 面 (surface, face). The various senses derive from the core idea of 'one surface' extended to 'whole surface', 'one aspect', and 'front page'.