国内外近几年的权威性研究，指出的英语口语焦虑的定义 ，并注明文献来源

近几年关于英语口语焦虑的权威性研究和定义如下：

1. Aida, Y. (1994):

   "Foreign language anxiety can be defined as a feeling of fear towards a foreign language setting where significant others judge competency."

   • 来源: Aida, Y. (1994). Examination of Horwitz et al.’s model of foreign language anxiety: The case of students in Japan. Modern Language Journal, 78(2), 233-244.

2. Horwitz, E.K. (2001):

   "Foreign language anxiety refers to a situation-specific anxiety that is incredibly intense and debilitating, specifically tied to the communicative use of an L2."

   • 来源: Horwitz, E. K. (2001). Language anxiety and achievements. Annual Review of Applied Linguistics, 21, 164-182.

3. Gkonou, C., & MacIntyre, P. D. (2017):

   "Communicative apprehension (CA) in relation to second languages [...] [is] the inhibition of cognitive processes involved in L2 communication and fluency due to worry or negative evaluation."

   • 来源: Gkonou, C., & MacIntyre, P. D. (2017). Autism spectrum disorder and anxiety in the communication classroom. System, 66, 106-114.

4. Cheng, X., & Horwitz, E. (2010):

   "[…] foreign language anxiety (FLA) is defined as 'a disproportionate, usually persistent fear of negative evaluation (i.e., anticipated or actual disapproval, ridicule, rejection, or criticism) from others—real or imagined—when speaking or learning a second language or participating in second language activities."

   • 来源: Cheng, X., & Horwitz, E. K. (2010). On measuring language anxiety: A review of the most commonly used scales. In X. Gao (Ed.), Language Teacher Psychology (pp. 146-156). Charlotte, NC: Information Age Publishing.

5. MacIntyre, P. D., & Gregersen, T. (2012):

   "L2 learners may experience social anxiety and foreign language anxiety, which affect their attendance at language class and their overall language proficiency."

   • 来源: MacIntyre, P.D., & Gregersen, T. (2012). Emotions that facilitate language learning: The positive-broadening power of the imagination. Language Teaching Research, 16(1), 156-170.

这些研究提供了英语口语焦虑的不同角度和层面的定义，并得到了学术界的认可。上述文献均可通过大学图书馆、学术数据库或在线档案等途径进一步搜索和阅读详细信息。需要注意的是，由于语言发展和全球化的进展，相关研究和定义会持续更新，上述信息仅供参考。