First Daughters often use their public platforms to support charitable causes and raise awareness.

The museum's new exhibit features several first rates that have never been displayed together before.

The philosophers debated whether multiple first causes could explain the universe's origin.

After lengthy negotiations, the treaty granted the airline first freedom rights, enabling it to fly over the neighboring country's territory without landing.

In many countries that use first past the post, smaller parties struggle to win representation even if they receive a significant share of the vote.

The private first class took extra night shifts to ensure his squad was ready for the inspection.

The sergeant first class led the squad through the night training exercise with calm authority.

Even though she was the new hire, she was soon on first-name terms with everyone in the office.

Don't cast the first stone if you were also part of the same mistake.

The first-passage time in a random walk is often used to estimate when a particle will first reach a designated site.