1) In posse 1) Possibly 
• (adv.) With power; potently. • (adv.) In a potential manner; possibly, not positively.
Po·ten'tial·ly adverb 1. With power; potently. [ Obsolete] 2. In a potential manner; possibly, not positively. « The duration of human souls is only potentially infinite.» Bentley. 
potentially 1. With a possibility of becoming actual or a reality. 2. Possibly but not yet actually: 'He provided potentially useful information.' 3. The inherent ability or capacity for growth, development, or coming into being.
adverb with a possibility of becoming actual; `introducing possibly dangerous innovations`; `he is potentially dangerous`; `potentially useful`