How to say "projection" in Japanese

• 投影とうえいCommon
  noun, suru verb, transitive verbProjection in the sense of casting a shadow or reflection — the image thrown onto a surface, as in shadow casting. Use this when something's shape is cast or reflected onto another surface.
• 突出とっしゅつCommon
  noun, suru verb, intransitive verbProjection as something jutting out or sticking out from a surface, emphasizing the act or state of protruding. A natural choice when describing something physically projecting outward from its surroundings.
• 写りうつりCommon
  noun, noun (suffix)Covers projection as the image itself — what is displayed or reflected, such as a picture on a screen or TV reception. Choose it when focusing on how something appears or is rendered rather than the casting process.
  このテレビ、チカチカしてどうも映うつりがよくないな。↗

  The picture on this TV is no good. It keeps flickering.
• 突起とっきCommon
  noun, suru verb, intransitive verbProjection as a physical protuberance — a raised part sticking out from a body or surface. It denotes the thing itself (a bump or prominence) rather than the action of projecting, so it suits anatomical or structural features.
• 投射とうしゃCommon
  noun, suru verb, transitive verbProjection specifically of an image, as when a picture is thrown onto a screen by a projector. This is the word for the act of projecting an image in that display sense.

Choose by sense: physical sticking-out uses 突出 or 突起, image display uses 投射, shadow/reflection uses 投影 or 「写り」; check which nuance of 'projection' you mean first.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 投影とうえいprojection (of a shadow)
• 突出とっしゅつprojection
• 映りうつりprojection
• 突起とっきprotuberance
• 投射とうしゃprojection (of an image)
• 映写えいしゃprojection (on a screen)
• 突き出しつきだしprotrusion
• 隆起りゅうきprotuberance
• 出っ張りでっぱりprojection
• プロジェクションprojection
• 射影しゃえいprojection
• 投写とうしゃprojection (of images)
• 出張りでばりprojection
• 投影図とうえいずprojection (drawing)
• 投出とうしゅつprojection
• 投企とうきprojection
• 自己投影じことうえいprojection
• 拡大推計かくだいすいけいextrapolation
• 突出物とっしゅつぶつexcrescence
• 射出しゃしゅつshooting
• 図法ずほうdrawing
• 投影図法とうえいずほう(method of) projection
• 投影法とうえいほう(method of) projection