lambda

What it means

1. The eleventh letter of the Classical and Modern Greek alphabet, the twelfth of the Old Greek alphabet.
2. mathematicsUnit representation of wavelength.
3. natural sciencesThe cosmological constant.

In a sentence

Lambda, on the other hand, was practically giddy when she finished crawling through the lander.

2022, James Breakwell, The Chosen Twelve

Where it comes from

1. Ancient Greekλάμβδα
2. Englishlambda

From Ancient Greek λάμβδα (lámbda). Doublet of lamed.