noun
1. becoming stronger
• Ant: ↑weakening
• Derivationally related forms: ↑strengthen
• Hypernyms: ↑transformation, ↑transmutation, ↑shift
2. the act of increasing the strength of something
• Ant: ↑weakening
• Derivationally related forms: ↑strengthen
• Hyponyms: ↑concentration
Useful english dictionary. 2012.