One of the mysteries of the English language finally explained.
1‘attendance at lectures is voluntary’
optional, discretionary, at one's discretion, elective, non-compulsory, non-mandatory, not required, open, open to choice, volitional, up to the individual
2‘she spent some time doing voluntary work’
unpaid, unsalaried, without pay, without payment, free of charge, without charge, for nothing, for free
honorary, volunteer, unrewarded
pro bono, pro bono publico
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