ἀκρογωνιαῖος

From the study of Ephesians 2:20

Range of meaning

Literally "(the stone) at the extreme/topmost corner," from akros ("outermost, highest, tip") + gōnia ("corner, angle"). It is not found in Greek before the Septuagint (the Greek Old Testament) and was probably coined by its translators. It names the one stone at a corner that the rest of the building depends on.

Against the English

BSB, ESV and NASB have "cornerstone" or "corner stone." KJV, WEB and YLT have "chief corner(stone)," where "chief" tries to carry the akro- ("extreme") part of the word. Few English versions follow the minority "capstone/keystone" reading, though some footnotes mention it.

How it drifted

Not drift in meaning but drift in picture. Modern English "cornerstone" brings to mind a ceremonial block with a date and inscription, set at a dedication ceremony and often holding nothing up. The ancient cornerstone did real structural work: it was the first great stone laid, and it set the level and the line of the walls running from it.

Used elsewhere in the period

Its clearest use in the Septuagint is Isaiah 28:16: "Behold, I will lay in the foundations (themelia) of Zion a costly, chosen cornerstone (akrogōniaion), precious, for its foundations." Ephesians 2:20 has the same pairing of "foundation" and "cornerstone," which strongly suggests Paul has this verse in mind. 1 Peter 2:6 quotes it outright and ties it to Psalm 118:22 ("head of the corner"). The Qumran Community Rule (1QS 8:7–8) applies Isaiah 28:16 to the community itself as a living temple: "the tested wall, the precious cornerstone." The capstone reading leans mainly on the Testament of Solomon (22:7–23:4), where a stone is raised to the top of the temple. That text is much later and of uncertain date.

From the study of 1 Peter 2:6

Range of meaning

Literally 'at the tip/extremity (akro-) of the corner (gōnia)'. A specialised building term found almost only in Jewish and Christian Greek. It means the corner block that sets the alignment of two walls, which is the stone everything else is measured from. Some scholars argue it could also mean a crowning stone at the top of a structure.

Against the English

'Cornerstone' (BSB, ESV, NIV) is accurate. 'Chief corner stone' (KJV, WEB) brings out the 'akro-' (extreme, highest-ranking) element. Modern English 'cornerstone' can suggest a ceremonial plaque-stone laid for show, but this is the stone that actually holds the building's geometry.

How it drifted

Modern ceremonial cornerstones, often inscribed and laid at a dedication, make the word sound decorative. The ancient stone carried weight and fixed the plan.

Used elsewhere in the period

First appears in the Greek Isaiah 28:16 ('I will lay into the foundations of Zion a stone… a corner-foundation stone… into its foundations'), translating Hebrew 'pinnat' (corner). Also Ephesians 2:20, where Christ is akrogōniaios of a temple built on apostles and prophets. Jeremias (TDNT) argued for a 'capstone/keystone' sense from later texts such as the Testament of Solomon 22–23. The Isaiah wording 'into the foundations' points to the base.