Noah Webster's Dictionary (a.) Right-angled; having one or more angles of ninety degrees.

Multi-Version Concordance Rectangular (2 Occurrences) 1 Kings 7:5 All the doors and posts were made square with beams: and window was over against window in three ranks. (See NIV) Ezekiel 41:21 As for the temple, the door posts were squared; and as for the face of the sanctuary, the appearance of it was as the appearance of the temple. (See NIV)