Formal, academic term for a system of ideas and beliefs. Often used in philosophical or sociological contexts. The cross-reference イデオロギー is a more common loanword synonym.
See also: イデオロギー
The ideology of that era strongly regulated people's behavior.
His paper analyzes the ideology of modern capitalism.
イデオロギー is the common loanword for 'ideology' and is used more broadly in everyday and political discourse. 観念形態 is a native Japanese compound used mainly in formal or academic writing.
Compound of 観念 (concept, idea) and 形態 (form, shape), literally 'idea-form'. The exact historical derivation is uncertain; it likely emerged as a translation term for 'ideology' in modern philosophical texts.