That ought not to be alleged, which, when tried is irrelevant.
Alterius circumventio alii non præbet actionem.
The deceiving of one person does not afford an action to another.
Alternativa petitio non est audienda.
An alternative petition is not to be heard.
Ambigua autem intentio ita accipienda est, ut res salva actori sit.
An ambiguous answer is so to be understood that the interest of the pleader may be safe.
Ambigua responsio contra proferentem est accipienda.
An ambiguous answer is to be considered as against the person who gives it.
Ambiguis casibus semper præsumitur pro rege.