Morgan Tsvangirai, whose MDC-T party is the biggest opposition in parliament, and Joice Mujuru, a former vice president, described the memorandum of understanding as a significant step in their efforts to form a coalition.
The memorandum of understanding signed today is a sign of the two political parties' desire to explore the possibility of working together in their bid to unseat the 93-year-old Mugabe.
Mugabe has said he will contest the election. He has been in power since the end of British colonial rule.
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