1.
vigor, spirits, energy, vitality
Mental and physical energy or vitality, especially in the context of refreshing oneself in preparation for future challenges. Most commonly used in the set phrase 英気を養う (to recharge one's energy).
Usage
Almost always appears in the fixed expression 英気を養う (to recharge one's energy/spirits). Implies resting and refreshing oneself before tackling an important task or challenge ahead.
Not to be confused with 鋭気 (sharp spirit, keenness), which has the same reading but different nuance.