ICA

1. Institute of Chartered Accountants (ICAEW of England and Wales; ICAI of Ireland)
2. Institute of Contemporary Arts
3. Invalid Care Allowance (now replaced by Carer's Allowance)

• mayest
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• May-game
• mayhap
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• may I ask
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• may it please you
• May-lady
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• May meetings
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• mayn't
• gammiest