The term paper abbreviation IBID stands for the Latin phrase 'ibidem, ' which means 'in the same place.' It is used to refer to a source that has already been cited in the same paper. The term paper abbreviation ETAL stands for the Latin phrase 'et alii, ' which means 'and others.' It is used to refer to multiple authors of a single source. Both IBID and ETAL are commonly used in academic writing to save space and time.